Buna rubber

The invention: The first practical synthetic rubber product developed, Buna inspired the creation of other other synthetic substances that eventually replaced natural rubber in industrial applications. The people behind the invention: Charles de la Condamine (1701-1774), a French naturalist Charles Goodyear (1800-1860), an American inventor Joseph Priestley (1733-1804), an English chemist Charles Greville Williams (1829-1910), an English chemist A New Synthetic Rubber The discovery of natural rubber is often credited to the French scientist Charles de la Condamine, who, in 1736, sent the French Academy of Science samples of an elastic material used by Peruvian Indians to make balls that bounced. The material was primarily a curiosity until 1770, when Joseph Priestley, an English chemist, discovered that it rubbed out pencil marks, after which he called it “rubber.” Natural rubber, made from the sap of the rubber tree (Hevea brasiliensis), became important after Charles Goodyear discovered in 1830 that heating rubber with sulfur (a process called “vulcanization”) made it more elastic and easier to use. Vulcanized natural rubber came to be used to make raincoats, rubber bands, and motor vehicle tires. Natural rubber is difficult to obtain (making one tire requires the amount of rubber produced by one tree in two years), and wars have often cut off supplies of this material to various countries. Therefore, efforts to manufacture synthetic rubber began in the late eighteenth century. Those efforts followed the discovery by English chemist Charles GrevilleWilliams and others in the 1860’s that natural rubber was composed of thousands of molecules of a chemical called isoprene that had been joined to form giant, necklace- like molecules. The first successful synthetic rubber, Buna, was patented by Germany’s I. G. Farben Industrie in 1926. The success of this rubber led to the development of many other synthetic rubbers, which are now used in place of natural rubber in many applications.From Erasers to Gas Pumps Natural rubber belongs to the group of chemicals called “polymers.” Apolymer is a giant molecule that is made up of many simpler chemical units (“monomers”) that are attached chemically to form long strings. In natural rubber, the monomer is isoprene (dimethylbutadiene). The first efforts to make a synthetic rubber used the discovery that isoprene could be made and converted into an elastic polymer. The synthetic rubber that was created from isoprene was, however, inferior to natural rubber. The first Buna rubber, which was patented by I. G. Farben in 1926, was better, but it was still less than ideal. Buna rubber was made by polymerizing the monomer butadiene in the presence of sodium. The name Buna comes from the first two letters of the words “butadiene” and “natrium” (German for sodium). Natural and Buna rubbers are called homopolymers because they contain only one kind of monomer. The ability of chemists to make Buna rubber, along with its successful use, led to experimentation with the addition of other monomers to isoprene-like chemicals used to make synthetic rubber. Among the first great successes were materials that contained two alternating monomers; such materials are called “copolymers.” If the two monomers are designated Aand B, part of a polymer molecule can be represented as (ABABABABABABABABAB). Numerous synthetic copolymers, which are often called “elastomers,” now replace natural rubber in applications where they have superior properties. All elastomers are rubbers, since objects made from them both stretch greatly when pulled and return quickly to their original shape when the tension is released. Two other well-known rubbers developed by I. G. Farben are the copolymers called Buna-N and Buna-S. These materials combine butadiene and the monomers acrylonitrile and styrene, respectively. Many modern motor vehicle tires are made of synthetic rubber that differs little from Buna-S rubber. This rubber was developed after the United States was cut off in the 1940’s, during World War II, from its Asian source of natural rubber. The solution to this problem was the development of a synthetic rubber industry based on GR-S rubber (government rubber plus styrene), which was essentially Buna-S rubber. This rubber is still widely used.Buna-S rubber is often made by mixing butadiene and styrene in huge tanks of soapy water, stirring vigorously, and heating the mixture. The polymer contains equal amounts of butadiene and styrene (BSBSBSBSBSBSBSBS). When the molecules of the Buna-S polymer reach the desired size, the polymerization is stopped and the rubber is coagulated (solidified) chemically. Then, water and all the unused starting materials are removed, after which the rubber is dried and shipped to various plants for use in tires and other products. The major difference between Buna-S and GR-S rubber is that the method of making GR-S rubber involves the use of low temperatures. Buna-N rubber is made in a fashion similar to that used for Buna- S, using butadiene and acrylonitrile. Both Buna-N and the related neoprene rubber, invented by Du Pont, are very resistant to gasoline and other liquid vehicle fuels. For this reason, they can be used in gas-pump hoses. All synthetic rubbers are vulcanized before they are used in industry. Impact Buna rubber became the basis for the development of the other modern synthetic rubbers. These rubbers have special properties that make them suitable for specific applications. One developmental approach involved the use of chemically modified butadiene in homopolymers such as neoprene. Made of chloroprene (chlorobutadiene), neoprene is extremely resistant to sun, air, and chemicals. It is so widely used in machine parts, shoe soles, and hoses that more than 400 million pounds are produced annually. Another developmental approach involved copolymers that alternated butadiene with other monomers. For example, the successful Buna-N rubber (butadiene and acrylonitrile) has properties similar to those of neoprene. It differs sufficiently from neoprene, however, to be used to make items such as printing press rollers. About 200 million pounds of Buna-N are produced annually. Some 4 billion pounds of the even more widely used polymer Buna-S/ GR-S are produced annually, most of which is used to make tires. Several other synthetic rubbers have significant industrial applications, and efforts to make copolymers for still other purposes continue.

Bullet train

The invention: An ultrafast passenger railroad system capable of moving passengers at speeds double or triple those of ordinary trains. The people behind the invention: Ikeda Hayato (1899-1965), Japanese prime minister from 1960 to 1964, who pushed for the expansion of public expenditures Shinji Sogo (1901-1971), the president of the Japanese National Railways, the “father of the bullet train” Building a Faster Train By 1900, Japan had a world-class railway system, a logical result of the country’s dense population and the needs of its modernizing economy. After 1907, the government controlled the system through the Japanese National Railways (JNR). In 1938, JNR engineers first suggested the idea of a train that would travel 125 miles per hour from Tokyo to the southern city of Shimonoseki. Construction of a rapid train began in 1940 but was soon stopped because of World War II. The 311-mile railway between Tokyo and Osaka, the Tokaido Line, has always been the major line in Japan. By 1957, a business express along the line operated at an average speed of 57 miles per hour, but the double-track line was rapidly reaching its transport capacity. The JNR established two investigative committees to explore alternative solutions. In 1958, the second committee recommended the construction of a high-speed railroad on a separate double track, to be completed in time for the Tokyo Olympics of 1964. The Railway Technical Institute of the JNR concluded that it was feasible to design a line that would operate at an average speed of about 130 miles per hour, cutting time for travel between Tokyo and Osaka from six hours to three hours. By 1962, about 17 miles of the proposed line were completed for test purposes. During the next two years, prototype trains were tested to correct flaws and make improvements in the design. The entire project was completed on schedule in July, 1964, with total construction costs of more than $1 billion, double the original estimates. The Speeding Bullet Service on the Shinkansen, or New Trunk Line, began on October 1, 1964, ten days before the opening of the Olympic Games. Commonly called the “bullet train” because of its shape and speed, the Shinkansen was an instant success with the public, both in Japan and abroad. As promised, the time required to travel between Tokyo and Osaka was cut in half. Initially, the system provided daily services of sixty trains consisting of twelve cars each, but the number of scheduled trains was almost doubled by the end of the year. The Shinkansen was able to operate at its unprecedented speed because it was designed and operated as an integrated system, making use of countless technological and scientific developments. Tracks followed the standard gauge of 56.5 inches, rather than the more narrow gauge common in Japan. For extra strength, heavy welded rails were attached directly onto reinforced concrete slabs. The minimum radius of a curve was 8,200 feet, except where sharper curves were mandated by topography. In many ways similar to modern airplanes, the railway cars were made airtight in order to prevent ear discomfort caused by changes in pressure when trains enter tunnels. The Shinkansen trains were powered by electric traction motors, with four 185-kilowatt motors on each car—one motor attached to each axle. This design had several advantages: It provided an even distribution of axle load for reducing strain on the tracks; it allowed the application of dynamic brakes (where the motor was used for braking) on all axles; and it prevented the failure of one or two units from interrupting operation of the entire train. The 25,000-volt electrical current was carried by trolley wire to the cars, where it was rectified into a pulsating current to drive the motors. The Shinkansen system established a casualty-free record because of its maintenance policies combined with its computerized Centralized Traffic Control system. The control room at Tokyo Station was designed to maintain timely information about the location of all trains and the condition of all routes. Although train operators had some discretion in determining speed, automatic brakes also operated to ensure a safe distance between trains. At least once each month, cars were thoroughly inspected; every ten days, an inspection train examined the conditions of tracks, communication equipment, and electrical systems. Impact Public usage of the Tokyo-Osaka bullet train increased steadily because of the system’s high speed, comfort, punctuality, and superb safety record. Businesspeople were especially happy that the rapid service allowed them to make the round-trip without the necessity of an overnight stay, and continuing modernization soon allowed nonstop trains to make a one-way trip in two and one-half hours, requiring speeds of 160 miles per hour in some stretches. By the early 1970’s, the line was transporting a daily average of 339,000 passengers in 240 trains, meaning that a train departed from Tokyo about every ten minutes The popularity of the Shinkansen system quickly resulted in demands for its extension into other densely populated regions. In 1972, a 100-mile stretch between Osaka and Okayama was opened for service. By 1975, the line was further extended to Hakata on the island of Kyushu, passing through the Kammon undersea tunnel. The cost of this 244-mile stretch was almost $2.5 billion. In 1982, lines were completed from Tokyo to Niigata and from Tokyo to Morioka. By 1993, the system had grown to 1,134 miles of track. Since high usage made the system extremely profitable, the sale of the JNR to private companies in 1987 did not appear to produce adverse consequences. The economic success of the Shinkansen had a revolutionary effect on thinking about the possibilities of modern rail transportation, leading one authority to conclude that the line acted as “a savior of the declining railroad industry.” Several other industrial countries were stimulated to undertake large-scale railway projects; France, especially, followed Japan’s example by constructing highspeed electric railroads from Paris to Nice and to Lyon. By the mid- 1980’s, there were experiments with high-speed trains based on magnetic levitation and other radical innovations, but it was not clear whether such designs would be able to compete with the Shinkansen model.

Bubble memory

The invention: An early nonvolatile medium for storing information on computers. The person behind the invention: Andrew H. Bobeck (1926- ), a Bell Telephone Laboratories scientist Magnetic Technology The fanfare over the commercial prospects of magnetic bubbles was begun on August 8, 1969, by a report appearing in both The New York Times and TheWall Street Journal. The early 1970’s would see the anticipation mount (at least in the computer world) with each prediction of the benefits of this revolution in information storage technology. Although it was not disclosed to the public until August of 1969, magnetic bubble technology had held the interest of a small group of researchers around the world for many years. The organization that probably can claim the greatest research advances with respect to computer applications of magnetic bubbles is Bell Telephone Laboratories (later part of American Telephone and Telegraph). Basic research into the properties of certain ferrimagnetic materials started at Bell Laboratories shortly after the end of World War II (1939-1945). Ferrimagnetic substances are typically magnetic iron oxides. Research into the properties of these and related compounds accelerated after the discovery of ferrimagnetic garnets in 1956 (these are a class of ferrimagnetic oxide materials that have the crystal structure of garnet). Ferrimagnetism is similar to ferromagnetism, the phenomenon that accounts for the strong attraction of one magnetized body for another. The ferromagnetic materials most suited for bubble memories contain, in addition to iron, the element yttrium or a metal from the rare earth series. It was a fruitful collaboration between scientist and engineer, between pure and applied science, that produced this promising breakthrough in data storage technology. In 1966, Bell Laboratories scientist Andrew H. Bobeck and his coworkers were the first to realize the data storage potential offered by the strange behavior of thin slices of magnetic iron oxides under an applied magnetic field. The first U.S. patent for a memory device using magnetic bubbles was filed by Bobeck in the fall of 1966 and issued on August 5, 1969. Bubbles Full of Memories The three basic functional elements of a computer are the central processing unit, the input/output unit, and memory. Most implementations of semiconductor memory require a constant power source to retain the stored data. If the power is turned off, all stored data are lost. Memory with this characteristic is called “volatile.” Disks and tapes, which are typically used for secondary memory, are “nonvolatile.” Nonvolatile memory relies on the orientation of magnetic domains, rather than on electrical currents, to sustain its existence. One can visualize by analogy how this will work by taking a group of permanent bar magnets that are labeled withNfor north at one end and S for south at the other. If an arrow is painted starting from the north end with the tip at the south end on each magnet, an orientation can then be assigned to a magnetic domain (here one whole bar magnet). Data are “stored” with these bar magnets by arranging them in rows, some pointing up, some pointing down. Different arrangements translate to different data. In the binary world of the computer, all information is represented by two states. A stored data item (known as a “bit,” or binary digit) is either on or off, up or down, true or false, depending on the physical representation. The “on” state is commonly labeled with the number 1 and the “off” state with the number 0. This is the principle behind magnetic disk and tape data storage. Now imagine a thin slice of a certain type of magnetic material in the shape of a 3-by-5-inch index card. Under a microscope, using a special source of light, one can see through this thin slice in many regions of the surface. Darker, snakelike regions can also be seen, representing domains of an opposite orientation (polarity) to the transparent regions. If a weak external magnetic field is then applied by placing a permanent magnet of the same shape as the card on the underside of the slice, a strange thing happens to the dark serpentine pattern—the long domains shrink and eventually contract into “bubbles,” tiny magnetized spots. Viewed from the side of the slice, the bubbles are cylindrically shaped domains having a polarity opposite to that of the material on which they rest. The presence or absence of a bubble indicates either a 0 or a 1 bit. Data bits are stored by moving the bubbles in the thin film. As long as the field is applied by the permanent magnet substrate, the data will be retained. The bubble is thus a nonvolatile medium for data storage.Consequences Magnetic bubble memory created quite a stir in 1969 with its splashy public introduction. Most of the manufacturers of computer chips immediately instituted bubble memory development projects. Texas Instruments, Philips, Hitachi, Motorola, Fujitsu, and International Business Machines (IBM) joined the race with Bell Laboratories to mass-produce bubble memory chips. Texas Instruments became the first major chip manufacturer to mass-produce bubble memories in the mid-to-late 1970’s. By 1990, however, almost all the research into magnetic bubble technology had shifted to Japan. Hitachi and Fujitsu began to invest heavily in this area. Mass production proved to be the most difficult task. Although the materials it uses are different, the process of producing magnetic bubble memory chips is similar to the process applied in producing semiconductor-based chips such as those used for random access memory (RAM). It is for this reason that major semiconductor manufacturers and computer companies initially invested in this technology. Lower fabrication yields and reliability issues plagued early production runs, however, and, although these problems have mostly been solved, gains in the performance characteristics of competing conventional memories have limited the impact that magnetic bubble technology has had on the marketplace. The materials used for magnetic bubble memories are costlier and possess more complicated structures than those used for semiconductor or disk memory. Speed and cost of materials are not the only bases for comparison. It is possible to perform some elementary logic with magnetic bubbles. Conventional semiconductor-based memory offers storage only. The capability of performing logic with magnetic bubbles puts bubble technology far ahead of other magnetic technologies with respect to functional versatility. Asmall niche market for bubble memory developed in the 1980’s. Magnetic bubble memory can be found in intelligent terminals, desktop computers, embedded systems, test equipment, and similar microcomputer- based systems.

Brownie camera

The invention: The first inexpensive and easy-to-use camera available to the general public, the Brownie revolutionized photography by making it possible for every person to become a photographer. The people behind the invention: George Eastman (1854-1932), founder of the Eastman Kodak Company Frank A. Brownell, a camera maker for the Kodak Company who designed the Brownie Henry M. Reichenbach, a chemist who worked with Eastman to develop flexible film William H. Walker, a Rochester camera manufacturer who collaborated with Eastman A New Way to Take Pictures In early February of 1900, the first shipments of a new small box camera called the Brownie reached Kodak dealers in the United States and England. George Eastman, eager to put photography within the reach of everyone, had directed Frank Brownell to design a small camera that could be manufactured inexpensively but that would still take good photographs. Advertisements for the Brownie proclaimed that everyone— even children—could take good pictures with the camera. The Brownie was aimed directly at the children’s market, a fact indicated by its box, which was decorated with drawings of imaginary elves called “Brownies” created by the Canadian illustrator Palmer Cox. Moreover, the camera cost only one dollar. The Brownie was made of jute board and wood, with a hinged back fastened by a sliding catch. It had an inexpensive two-piece glass lens and a simple rotary shutter that allowed both timed and instantaneous exposures to be made. With a lens aperture of approximately f14 and a shutter speed of approximately 1/50 of a second, the Brownie was certainly capable of taking acceptable snapshots. It had no viewfinder; however, an optional clip-on reflecting viewfinder was available. The camera came loaded with a six-exposure roll of Kodak film that produced square negatives 2.5 inches on a side. This film could be developed, printed, and mounted for forty cents, and a new roll could be purchased for fifteen cents. George Eastman’s first career choice had been banking, but when he failed to receive a promotion he thought he deserved, he decided to devote himself to his hobby, photography. Having worked with a rigorous wet-plate process, he knew why there were few amateur photographers at the time—the whole process, from plate preparation to printing, was too expensive and too much trouble. Even so, he had already begun to think about the commercial possibilities of photography; after reading of British experiments with dry-plate technology, he set up a small chemical laboratory and came up with a process of his own. The Eastman Dry Plate Company became one of the most successful producers of gelatin dry plates. Dry-plate photography had attracted more amateurs, but it was still a complicated and expensive hobby. Eastman realized that the number of photographers would have to increase considerably if the market for cameras and supplies were to have any potential. In the early 1880’s, Eastman first formulated the policies that would make the Eastman Kodak Company so successful in years to come: mass production, low prices, foreign and domestic distribution, and selling through extensive advertising and by demonstration. In his efforts to expand the amateur market, Eastman first tackled the problem of the glass-plate negative, which was heavy, fragile, and expensive to make. By 1884, his experiments with paper negatives had been successful enough that he changed the name of his company to The Eastman Dry Plate and Film Company. Since flexible roll film needed some sort of device to hold it steady in the camera’s focal plane, Eastman collaborated with William Walker to develop the Eastman-Walker roll-holder. Eastman’s pioneering manufacture and use of roll films led to the appearance on the market in the 1880’s of a wide array of hand cameras from a number of different companies. Such cameras were called “detective cameras” because they were small and could be used surreptitiously. The most famous of these, introduced by Eastman in 1888, was named the “Kodak”—a word he coined to be terse, distinctive, and easily pronounced in any language. This camera’s simplicity of operation was appealing to the general public and stimulated the growth of amateur photography. The Camera The Kodak was a box about seven inches long and four inches wide, with a one-speed shutter and a fixed-focus lens that produced reasonably sharp pictures. It came loaded with enough roll film to make one hundred exposures. The camera’s initial price of twentyfive dollars included the cost of processing the first roll of film; the camera also came with a leather case and strap. After the film was exposed, the camera was mailed, unopened, to the company’s plant in Rochester, New York, where the developing and printing were done. For an additional ten dollars, the camera was reloaded and sent back to the customer. The Kodak was advertised in mass-market publications, rather than in specialized photographic journals, with the slogan: “You press the button, we do the rest.”With his introduction of a camera that was easy to use and a service that eliminated the need to know anything about processing negatives, Eastman revolutionized the photographic market. Thousands of people no longer depended upon professional photographers for their portraits but instead learned to make their own. In 1892, the Eastman Dry Plate and Film Company became the Eastman Kodak Company, and by the mid- 1890’s, one hundred thousand Kodak cameras had been manufactured and sold, half of them in Europe by Kodak Limited. Having popularized photography with the first Kodak, in 1900 Eastman turned his attention to the children’s market with the introduction of the Brownie. The first five thousand cameras sent to dealers were sold immediately; by the end of the following year, almost a quarter of a million had been sold. The Kodak Company organized Brownie camera clubs and held competitions specifically for young photographers. The Brownie came with an instruction booklet that gave children simple directions for taking successful pictures, and “The Brownie Boy,” an appealing youngster who loved photography, became a standard feature of Kodak’s advertisements. Impact Eastman followed the success of the first Brownie by introducing several additional models between 1901 and 1917. Each was a more elaborate version of the original. These Brownie box cameras were on the market until the early 1930’s, and their success inspired other companies to manufacture box cameras of their own. In 1906, the Ansco company produced the Buster Brown camera in three sizes that corresponded to Kodak’s Brownie camera range; in 1910 and 1914, Ansco made three more versions. The Seneca company’s Scout box camera, in three sizes, appeared in 1913, and Sears Roebuck’s Kewpie cameras, in five sizes, were sold beginning in 1916. In England, the Houghtons company introduced its first Scout camera in 1901, followed by another series of four box cameras in 1910 sold under the Ensign trademark. Other English manufacturers of box cameras included the James Sinclair company, with its Traveller Una of 1909, and the Thornton-Pickard company, with a Filma camera marketed in four sizes in 1912. After World War I ended, several series of box cameras were manufactured in Germany by companies that had formerly concentrated on more advanced and expensive cameras. The success of box cameras in other countries, led by Kodak’s Brownie, undoubtedly prompted this trend in the German photographic industry. The Ernemann Film K series of cameras in three sizes, introduced in 1919, and the all-metal Trapp LittleWonder of 1922 are examples of popular German box cameras. In the early 1920’s, camera manufacturers began making boxcamera bodies from metal rather than from wood and cardboard. Machine-formed metal was less expensive than the traditional handworked materials. In 1924, Kodak’s two most popular Brownie sizes appeared with aluminum bodies. In 1928, Kodak Limited of England added two important new features to the Brownie—a built-in portrait lens, which could be brought in front of the taking lens by pressing a lever, and camera bodies in a range of seven different fashion colors. The Beau Brownie cameras, made in 1930, were the most popular of all the colored box cameras. The work ofWalter Dorwin Teague, a leading American designer, these cameras had an Art Deco geometric pattern on the front panel, which was enameled in a color matching the leatherette covering of the camera body. Several other companies, including Ansco, again followed Kodak’s lead and introduced their own lines of colored cameras. In the 1930’s, several new box cameras with interesting features appeared, many manufactured by leading film companies. In France, the Lumiere Company advertised a series of box cameras—the Luxbox, Scoutbox, and Lumibox—that ranged from a basic camera to one with an adjustable lens and shutter. In 1933, the German Agfa company restyled its entire range of box cameras, and in 1939, the Italian Ferrania company entered the market with box cameras in two sizes. In 1932, Kodak redesigned its Brownie series to take the new 620 roll film, which it had just introduced. This film and the new Six-20 Brownies inspired other companies to experiment with variations of their own; some box cameras, such as the Certo Double-box, the Coronet Every Distance, and the Ensign E-20 cameras, offered a choice of two picture formats. Another new trend was a move toward smaller-format cameras using standard 127 roll film. In 1934, Kodak marketed the small Baby Brownie. Designed by Teague and made from molded black plastic, this little camera with a folding viewfinder sold for only one dollar—the price of the original Brownie in 1900. The Baby Brownie, the first Kodak camera made of molded plastic, heralded the move to the use of plastic in camera manufacture. Soon many others, such as the Altissa series of box cameras and the Voigtlander Brilliant V/6 camera, were being made from this new material. Later Trends By the late 1930’s, flashbulbs had replaced flash powder for taking pictures in low light; again, the Eastman Kodak Company led the way in introducing this new technology as a feature on the inexpensive box camera. The Falcon Press-Flash, marketed in 1939, was the first mass-produced camera to have flash synchronization and was followed the next year by the Six-20 Flash Brownie, which had a detachable flash gun. In the early 1940’s, other companies, such as Agfa-Ansco, introduced this feature on their own box cameras.In the years after World War II, the box camera evolved into an eye-level camera, making it more convenient to carry and use. Many amateur photographers, however, still had trouble handling paper-backed roll film and were taking their cameras back to dealers to be unloaded and reloaded. Kodak therefore developed a new system of film loading, using the Kodapak cartridge, which could be mass-produced with a high degree of accuracy by precision plastic- molding techniques. To load the camera, the user simply opened the camera back and inserted the cartridge. This new film was introduced in 1963, along with a series of Instamatic cameras designed for its use. Both were immediately successful. The popularity of the film cartridge ended the long history of the simple and inexpensive roll film camera. The last English Brownie was made in 1967, and the series of Brownies made in the United States was discontinued in 1970. Eastman’s original marketing strategy of simplifying photography in order to increase the demand for cameras and film continued, however, with the public’s acceptance of cartridge-loading cameras such as the Instamatic. From the beginning, Eastman had recognized that there were two kinds of photographers other than professionals. The first, he declared, were the true amateurs who devoted time enough to acquire skill in the complex processing procedures of the day. The second were those who merely wanted personal pictures or memorabilia of their everyday lives, families, and travels. The second class, he observed, outnumbered the first by almost ten to one. Thus, it was to this second kind of amateur photographer that Eastman had appealed, both with his first cameras and with his advertising slogan, “You press the button, we do the rest.” Eastman had done much more than simply invent cameras and films; he had invented a system and then developed the means for supporting that system. This is essentially what the Eastman Kodak Company continued to accomplish with the series of Instamatics and other descendants of the original Brownie. In the decade between 1963 and 1973, for example, approximately sixty million Instamatics were sold throughout the world. The research, manufacturing, and marketing activities of the Eastman Kodak Company have been so complex and varied that no one would suggest that the company’s prosperity rests solely on the success of its line of inexpensive cameras and cartridge films, although these have continued to be important to the company. Like Kodak, however, most large companies in the photographic industry have expanded their research to satisfy the ever-growing demand from amateurs. The amateurism that George Eastman recognized and encouraged at the beginning of the twentieth century thus still flourished at its end.

Broadcaster guitar

The invention: The first commercially manufactured solid-body electric guitar, the Broadcaster revolutionized the guitar industry and changed the face of popular music The people behind the invention: Leo Fender (1909-1991), designer of affordable and easily massproduced solid-body electric guitars Les Paul (Lester William Polfuss, 1915- ), a legendary guitarist and designer of solid-body electric guitars Charlie Christian (1919-1942), an influential electric jazz guitarist of the 1930’s Early Electric Guitars It has been estimated that between 1931 and 1937, approximately twenty-seven hundred electric guitars and amplifiers were sold in the United States. The Electro String Instrument Company, run by Adolph Rickenbacker and his designer partners, George Beauchamp and Paul Barth, produced two of the first commercially manufactured electric guitars—the Rickenbacker A-22 and A-25—in 1931. The Rickenbacker models were what are known as “lap steel” or Hawaiian guitars. A Hawaiian guitar is played with the instrument lying flat across a guitarist’s knees. By the mid-1930’s, the Gibson company had introduced an electric Spanish guitar, the ES-150. Legendary jazz guitarist Charlie Christian made this model famous while playing for Benny Goodman’s orchestra. Christian was the first electric guitarist to be heard by a large American audience. He became an inspiration for future electric guitarists, because he proved that the electric guitar could have its own unique solo sound. Along with Christian, the other electric guitar figures who put the instrument on the musical map were blues guitarist T-Bone Walker, guitarist and inventor Les Paul, and engineer and inventor Leo Fender. Early electric guitars were really no more than acoustic guitars, with the addition of one or more pickups, which convert string vibrations to electrical signals that can be played through a speaker. Amplification of a guitar made it a more assertive musical instrument. The electrification of the guitar ultimately would make it more flexible, giving it a more prominent role in popular music. Les Paul, always a compulsive inventor, began experimenting with ways of producing an electric solid-body guitar in the late 1930’s. In 1929, at the age of thirteen, he had amplified his first acoustic guitar. Another influential inventor of the 1940’s was Paul Bigsby. He built a prototype solid-body guitar for country music star Merle Travis in 1947. It was Leo Fender who revolutionized the electric guitar industry by producing the first commercially viable solid-body electric guitar, the Broadcaster, in 1948.Leo Fender Leo Fender was born in the Anaheim, California, area in 1909. As a teenager, he began to build and repair guitars. By the 1930’s, Fender was building and renting out public address systems for group gatherings. In 1937, after short tenures of employment with the Division of Highways and the U.S. Tire Company, he opened a radio repair company in Fullerton, California. Always looking to expand and invent new and exciting electrical gadgets, Fender and Clayton Orr “Doc” Kauffman started the K & F Company in 1944. Kauffman was a musician and a former employee of the Electro String Instrument Company. The K & F Company lasted until 1946 and produced steel guitars and amplifiers. After that partnership ended, Fender founded the Fender Electric Instruments Company. With the help of George Fullerton, who joined the company in 1948, Fender developed the Fender Broadcaster. The body of the Broadcaster was made of a solid plank of ash wood. The corners of the ash body were rounded. There was a cutaway located under the joint with the solid maple neck, making it easier for the guitarist to access the higher frets. The maple neck was bolted to the body of the guitar, which was unusual, since most guitar necks prior to the Broadcaster had been glued to the body. Frets were positioned directly into designed cuts made in the maple of the neck. The guitar had two pickups. The Fender Electric Instruments Company made fewer than one thousand Broadcasters. In 1950, the name of the guitar was changed from the Broadcaster to the Telecaster, as the Gretsch company had already registered the name Broadcaster for some of its drums and banjos. Fender decided not to fight in court over use of the name. Leo Fender has been called the Henry Ford of the solid-body electric guitar, and the Telecaster became known as the Model T of the industry. The early Telecasters sold for $189.50. Besides being inexpensive, the Telecaster was a very durable instrument. Basically, the Telecaster was a continuation of the Broadcaster. Fender did not file for a patent on its unique bridge pickup until January 13, 1950, and he did not file for a patent on the Telecaster’s unique body shape until April 3, 1951. In the music industry during the late 1940’s, it was important for a company to unveil new instruments at trade shows. At this time, there was only one important trade show, sponsored by the National Association of Music Merchants. The Broadcaster was first sprung on the industry at the 1948 trade show in Chicago. The industry had seen nothing like this guitar ever before. This new guitar existed only to be amplified; it was not merely an acoustic guitar that had been converted. Impact The Telecaster, as it would be called after 1950, remained in continuous production for more years than any other guitar of its type and was one of the industry’s best sellers. From the beginning, it looked and sounded unique. The electrified acoustic guitars had a mellow woody tone, whereas the Telecaster had a clean twangy tone. This tone made it popular with country and blues guitarists. The Telecaster could also be played at higher volume than previous electric guitars. Because Leo Fender attempted something revolutionary by introducing an electric solid-body guitar, there was no guarantee that his business venture would succeed. Fender Electric Instruments Company had fifteen employees in 1947. At times, during the early years of the company, it looked as though Fender’s dreams would not come to fruition, but the company persevered and grew. Between 1948 and 1955 with an increase of employees, the company was able to produce ten thousand Broadcaster/Telecaster guitars. Fender had taken a big risk, but it paid off enormously. Between 1958 and the mid-1970’s, Fender produced more than 250,000 Telecasters. Other guitar manufacturers were placed in a position of having to catch up. Fender had succeeded in developing a process by which electric solid-body guitars could be manufactured profitably on a large scale. Early Guitar Pickups The first pickups used on a guitar can be traced back to the 1920’s and the efforts of Lloyd Loar, but there was not strong interest on the part of the American public for the guitar to be amplified. The public did not become intrigued until the 1930’s. Charlie Christian’s electric guitar performances with Benny Goodman woke up the public to the potential of this new and exciting sound. It was not until the 1950’s, though, that the electric guitar became firmly established. Leo Fender was the right man in the right place. He could not have known that his Fender guitars would help to usher in a whole new musical landscape. Since the electric guitar was the newest member of the family of guitars, it took some time for musical audiences to fully appreciate what it could do. The electric solid-body guitar has been called a dangerous, uncivilized instrument. The youth culture of the 1950’s found in this new guitar a voice for their rebellion. Fender unleashed a revolution not only in the construction of a guitar but also in the way popular music would be approached henceforth. Because of the ever-increasing demand for the Fender product, Fender Sales was established as a separate distribution company in 1953 by Don Randall. Fender Electric Instruments Company had fifteen employees in 1947, but by 1955, the company employed fifty people. By 1960, the number of employees had risen to more than one hundred. Before Leo Fender sold the company to CBS on January 4, 1965, for $13 million, the company occupied twenty-seven buildings and employed more than five hundred workers. Always interested in finding new ways of designing a more nearly perfect guitar, Leo Fender again came up with a remarkable guitar in 1954, with the Stratocaster. There was talk in the guitar industry that Fender had gone too far with the introduction of the Stratocaster, but it became a huge success because of its versatility. It was the first commercial solid-body electric guitar to have three pickups and a vibrato bar. It was also easier to play than the Telecaster because of its double cutaway, contoured body, and scooped back. The Stratocaster sold for $249.50. Since its introduction, the Stratocaster has undergone some minor changes, but Fender and his staff basically got it right the first time. The Gibson company entered the solid-body market in 1952 with the unveiling of the “Les Paul” model. After the Telecaster, the Les Paul guitar was the next significant solid-body to be introduced. Les Paul was a legendary guitarist who also had been experimenting with electric guitar designs for many years. The Gibson designers came up with a striking model that produced a thick rounded tone. Over the years, the Les Paul model has won a loyal following. The Precision Bass In 1951, Leo Fender introduced another revolutionary guitar, the Precision bass. At a cost of $195.50, the first electric bass would go on to dominate the market. The Fender company has manufactured numerous guitar models over the years, but the three that stand above all others in the field are the Telecaster, the Precision bass, and the Stratocaster. The Telecaster is considered to be more of a workhorse, whereas the Stratocaster is thought of as the thoroughbred of electric guitars. The Precision bass was in its own right a revolutionary guitar. With a styling that had been copied from the Telecaster, the Precision freed musicians from bulky oversized acoustic basses, which were prone to feedback. The name Precision had meaning. Fender’s electric bass made it possible, with its frets, for the precise playing of notes; many acoustic basses were fretless. The original Precision bass model was manufactured from 1951 to 1954. The next version lasted from 1954 until June of 1957. The Precision bass that went into production in June, 1957, with its split humbucking pickup, continued to be the standard electric bass on the market into the 1990’s. By 1964, the Fender Electric Instruments Company had grown enormously. In addition to Leo Fender, a number of crucial people worked for the organization, including George Fullerton and Don Randall. Fred Tavares joined the company’s research and development team in 1953. In May, 1954, Forrest White became Fender’s plant manager. All these individuals played vital roles in the success of Fender, but the driving force behind the scene was always Leo Fender. As Fender’s health deteriorated, Randall commenced negotiations with CBS to sell the Fender company. In January, 1965, CBS bought Fender for $13 million. Eventually, Leo Fender regained his health, and he was hired as a technical adviser by CBS/Fender. He continued in this capacity until 1970. He remained determined to create more guitar designs of note. Although he never again produced anything that could equal his previous success, he never stopped trying to attain a new perfection of guitar design. Fender died on March 21, 1991, in Fullerton, California. He had suffered for years from Parkinson’s disease, and he died of complications from the disease. He is remembered for his Broadcaster/ Telecaster, Precision bass, and Stratocaster, which revolutionized popular music. Because the Fender company was able to mass produce these and other solid-body electric guitars, new styles of music that relied on the sound made by an electric guitar exploded onto the scene. The electric guitar manufacturing business grew rapidly after Fender introduced mass production. Besides American companies, there are guitar companies that have flourished in Europe and Japan. The marriage between rock music and solid-body electric guitars was initiated by the Fender guitars. The Telecaster, Precision bass, and Stratocaster become synonymous with the explosive character of rock and roll music. The multi-billion-dollar music business can point to Fender as the pragmatic visionary who put the solid-body electric guitar into the forefront of the musical scene. His innovative guitars have been used by some of the most important guitarists of the rock era, including Jimi Hendrix, Eric Clapton, and Jeff Beck. More important, Fender guitars have remained bestsellers with the public worldwide. Amateur musicians purchased them by the thousands for their own entertainment. Owning and playing a Fender guitar, or one of the other electric guitars that followed, allowed these amateurs to feel closer to their musician idols. A large market for sheet music from popular artists also developed. In 1992, Fender was inducted into the Rock and Roll Hall of Fame. He is one of the few non-musicians ever to be inducted. The sound of an electric guitar is the sound of exuberance, and since the Broadcaster was first unveiled in 1948, that sound has grown to be pervasive and enormously profitable.

Breeder reactor

The invention: A plant that generates electricity from nuclear fission while creating new fuel. The person behind the invention: Walter Henry Zinn (1906-2000), the first director of the Argonne National Laboratory Producing Electricity with More Fuel The discovery of nuclear fission involved both the discovery that the nucleus of a uranium atom would split into two lighter elements when struck by a neutron and the observation that additional neutrons, along with a significant amount of energy, were released at the same time. These neutrons might strike other atoms and cause them to fission (split) also. That, in turn, would release more energy and more neutrons, triggering a chain reaction as the process continued to repeat itself, yielding a continuing supply of heat. Besides the possibility that an explosive weapon could be constructed, early speculation about nuclear fission included its use in the generation of electricity. The occurrence of World War II (1939- 1945) meant that the explosive weapon would be developed first. Both the weapons technology and the basic physics for the electrical reactor had their beginnings in Chicago with the world’s first nuclear chain reaction. The first self-sustaining nuclear chain reaction occurred in a laboratory at the University of Chicago on December 2, 1942. It also became apparent at that time that there was more than one way to build a bomb. At this point, two paths were taken: One was to build an atomic bomb with enough fissionable uranium in it to explode when detonated, and another was to generate fissionable plutonium and build a bomb. Energy was released in both methods, but the second method also produced another fissionable substance. The observation that plutonium and energy could be produced together meant that it would be possible to design electric power systems that would produce fissionable plutonium in quantities as large as, or larger than, the amount of fissionable material consumed. This is the breeder concept, the idea that while using up fissionable uranium 235, another fissionable element can be made. The full development of this concept for electric power was delayed until the end of WorldWar II. Electricity from Atomic Energy On August 1, 1946, the Atomic Energy Commission (AEC) was established to control the development and explore the peaceful uses of nuclear energy. The Argonne National Laboratory was assigned the major responsibilities for pioneering breeder reactor technologies.Walter Henry Zinn was the laboratory’s first director. He led a team that planned a modest facility (Experimental Breeder Reactor I, or EBR-I) for testing the validity of the breeding principle. Planning for this had begun in late 1944 and grew as a natural extension of the physics that developed the plutonium atomic bomb. The conceptual design details for a breeder-electric reactor were reasonably complete by late 1945. On March 1, 1949, the AEC announced the selection of a site in Idaho for the National Reactor Station (later to be named the Idaho National Engineering Laboratory, or INEL). Construction at the INEL site in Arco, Idaho, began in October, 1949. Critical mass was reached in August, 1951. (“Critical mass” is the amount and concentration of fissionable material required to produce a self-sustaining chain reaction.) The system was brought to full operating power, 1.1 megawatts of thermal power, on December 19, 1951. The next day, December 20, at 11:00 a.m., steam was directed to a turbine generator. At 1:23 p.m., the generator was connected to the electrical grid at the site, and “electricity flowed from atomic energy,” in the words of Zinn’s console log of that day. Approximately 200 kilowatts of electric power were generated most of the time that the reactor was run. This was enough to satisfy the needs of the EBR-I facilities. The reactor was shut down in 1964 after five years of use primarily as a test facility. It had also produced the first pure plutonium. With the first fuel loading, a conversion ratio of 1.01 was achieved, meaning that more new fuel was generated than was consumed by about 1 percent. When later fuel loadings were made with plutonium, the conversion ratios were more favorable, reaching as high as 1.27. EBR-I was the first reactor to generate its own fuel and the first power reactor to use plutonium for fuel. The use of EBR-I also included pioneering work on fuel recovery and reprocessing. During its five-year lifetime, EBR-I operated with four different fuel loadings, each designed to establish specific benchmarks of breeder technology. This reactor was seen as the first in a series of increasingly large reactors in a program designed to develop breeder technology. The reactor was replaced by EBR-II, which had been proposed in 1953 and was constructed from 1955 to 1964. EBR-II was capable of producing 20 megawatts of electrical power. It was approximately fifty times more powerful than EBR-I but still small compared to light-water commercial reactors of 600 to 1,100 megawatts in use toward the end of the twentieth century. Consequences The potential for peaceful uses of nuclear fission were dramatized with the start-up of EBR-I in 1951: It was the first in the world to produce electricity, while also being the pioneer in a breeder reactor program. The breeder program was not the only reactor program being developed, however, and it eventually gave way to the light-water reactor design for use in the United States. Still, if energy resources fall into short supply, it is likely that the technologies first developed with EBR-I will find new importance. In France and Japan, commercial reactors make use of breeder reactor technology; these reactors require extensive fuel reprocessing. Following the completion of tests with plutonium loading in 1964, EBR-I was shut down and placed in standby status. In 1966, it was declared a national historical landmark under the stewardship of the U.S. Department of the Interior. The facility was opened to the public in June, 1975.

Blood transfusion

The invention: A technique that greatly enhanced surgery patients’ chances of survival by replenishing the blood they lose in surgery with a fresh supply. The people behind the invention: Charles Drew (1904-1950), American pioneer in blood transfusion techniques George Washington Crile (1864-1943), an American surgeon, author, and brigadier general in the U.S. Army Medical Officers’ Reserve Corps Alexis Carrel (1873-1944), a French surgeon Samuel Jason Mixter (1855-1923), an American surgeon Nourishing Blood Transfusions It is impossible to say when and where the idea of blood transfusion first originated, although descriptions of this procedure are found in ancient Egyptian and Greek writings. The earliest documented case of a blood transfusion is that of Pope Innocent VII. In April, 1492, the pope, who was gravely ill, was transfused with the blood of three young boys. As a result, all three boys died without bringing any relief to the pope. In the centuries that followed, there were occasional descriptions of blood transfusions, but it was not until the middle of the seventeenth century that the technique gained popularity following the English physician and anatomistWilliam Harvey’s discovery of the circulation of the blood in 1628. In the medical thought of those times, blood transfusion was considered to have a nourishing effect on the recipient. In many of those experiments, the human recipient received animal blood, usually from a lamb or a calf. Blood transfusion was tried as a cure for many different diseases, mainly those that caused hemorrhages, as well as for other medical problems and even for marital problems. Blood transfusions were a dangerous procedure, causing many deaths of both donor and recipient as a result of excessive blood loss, infection, passage of blood clots into the circulatory systems of the recipients, passage of air into the blood vessels (air embolism), and transfusion reaction as a result of incompatible blood types. In the mid-nineteenth century, blood transfusions from animals to humans stopped after it was discovered that the serum of one species agglutinates and dissolves the blood cells of other species. A sharp drop in the use of blood transfusion came with the introduction of physiologic salt solution in 1875. Infusion of salt solution was simple and was safer than blood transfusion.Direct-Connection Blood Transfusions In 1898, when GeorgeWashington Crile began his work on blood transfusions, the major obstacle he faced was solving the problem of blood clotting during transfusions. He realized that salt solutions were not helpful in severe cases of blood loss, when there is a need to restore the patient to consciousness, steady the heart action, and raise the blood pressure. At that time, he was experimenting with indirect blood transfusions by drawing the blood of the donor into a vessel, then transferring it into the recipient’s vein by tube, funnel, and cannula, the same technique used in the infusion of saline solution. The solution to the problem of blood clotting came in 1902 when Alexis Carrel developed the technique of surgically joining blood vessels without exposing the blood to air or germs, either of which can lead to clotting. Crile learned this technique from Carrel and used it to join the peripheral artery in the donor to a peripheral vein of the recipient. Since the transfused blood remained sealed in the inner lining of the vessels, blood clotting did not occur. The first human blood transfusion of this type was performed by Crile in December, 1905. The patient, a thirty-five-year-old woman, was transfused by her husband but died a few hours after the procedure. The second, but first successful, transfusion was performed on August 8, 1906. The patient, a twenty-three-year-old male, suffered from severe hemorrhaging following surgery to remove kidney stones. After all attempts to stop the bleeding were exhausted with no results, and the patient was dangerously weak, transfusion was considered as a last resort. One of the patient’s brothers was the dofew days later, another transfusion was done. This time, too, he showed remarkable improvement, which continued until his complete recovery. For his first transfusions, Crile used the Carrel suture method, which required using very fine needles and thread. It was a very delicate and time-consuming procedure. At the suggestion of Samuel Jason Mixter, Crile developed a new method using a short tubal device with an attached handle to connect the blood vessels. By this method, 3 or 4 centimeters of the vessels to be connected were surgically exposed, clamped, and cut, just as under the previous method. Yet, instead of suturing of the blood vessels, the recipient’s vein was passed through the tube and then cuffed back over the tube and tied to it. Then the donor’s artery was slipped over the cuff. The clamps were opened, and blood was allowed to flow from the donor to the recipient. In order to accommodate different-sized blood vessels, tubes of four different sizes were made, ranging in diameter from 1.5 to 3 millimeters.Impact, Crile’s method was the preferred method of blood transfusion for a number of years. Following the publication of his book on transfusion, a number of modifications to the original method were published in medical journals. In 1913, Edward Lindeman developed a method of transfusing blood simply by inserting a needle through the patient’s skin and into a surface vein, making it for the first time a nonsurgical method. This method allowed one to measure the exact quantity of blood transfused. It also allowed the donor to serve in multiple transfusions. This development opened the field of transfusions to all physicians. Lindeman’s needle and syringe method also eliminated another major drawback of direct blood transfusion: the need to have both donor and recipient right next to each other.

Birth control pill

The invention: An orally administered drug that inhibits ovulation in women, thereby greatly reducing the chance of pregnancy. The people behind the invention: Gregory Pincus (1903-1967), an American biologist Min-Chueh Chang (1908-1991), a Chinese-born reproductive biologist John Rock (1890-1984), an American gynecologist Celso-Ramon Garcia (1921- ), a physician Edris Rice-Wray (1904- ), a physician Katherine Dexter McCormick (1875-1967), an American millionaire Margaret Sanger (1879-1966), an American activist An Ardent Crusader Margaret Sanger was an ardent crusader for birth control and family planning. Having decided that a foolproof contraceptive was necessary, Sanger met with her friend, the wealthy socialite Katherine Dexter McCormick. A1904 graduate in biology from the Massachusetts Institute of Technology, McCormick had the knowledge and the vision to invest in biological research. Sanger arranged a meeting between McCormick and Gregory Pincus, head of the Worcester Institutes of Experimental Biology. After listening to Sanger’s pleas for an effective contraceptive and McCormick’s offer of financial backing, Pincus agreed to focus his energies on finding a pill that would prevent pregnancy. Pincus organized a team to conduct research on both laboratory animals and humans. The laboratory studies were conducted under the direction of Min-Chueh Chang, a Chinese-born scientist who had been studying sperm biology, artificial insemination, and in vitro fertilization. The goal of his research was to see whether pregnancy might be prevented by manipulation of the hormones usually found in a woman.It was already known that there was one time when a woman could not become pregnant—when she was already pregnant. In 1921, Ludwig Haberlandt, an Austrian physiologist, had transplanted the ovaries from a pregnant rabbit into a nonpregnant one. The latter failed to produce ripe eggs, showing that some substance from the ovaries of a pregnant female prevents ovulation. This substance was later identified as the hormone progesterone by George W. Corner, Jr., and Willard M. Allen in 1928. If progesterone could inhibit ovulation during pregnancy, maybe progesterone treatment could prevent ovulation in nonpregnant females as well. In 1937, this was shown to be the case by scientists from the University of Pennsylvania, who prevented ovulation in rabbits with injections of progesterone. It was not until 1951, however, when Carl Djerassi and other chemists devised inexpensive ways of producing progesterone in the laboratory, that serious consideration was given to the medical use of progesterone. The synthetic version of progesterone was called “progestin.” Testing the Pill In the laboratory, Chang tried more than two hundred different progesterone and progestin compounds, searching for one that would inhibit ovulation in rabbits and rats. Finally, two compounds were chosen: progestins derived from the root of a wild Mexican yam. Pincus arranged for clinical tests to be carried out by Celso- Ramon Garcia, a physician, and John Rock, a gynecologist. Rock had already been conducting experiments with progesterone as a treatment for infertility. The treatment was effective in some women but required that large doses of expensive progesterone be injected daily. Rock was hopeful that the synthetic progestin that Chang had found effective in animals would be helpful in infertile women as well. With Garcia and Pincus, Rock treated another group of fifty infertile women with the synthetic progestin. After treatment ended, seven of these previously infertile women became pregnant within half a year. Garcia, Pincus, and Rock also took several physiological measurements of the women while they were taking the progestin and were able to conclude that ovulation did not occur while the women were taking the progestin pill.Having shown that the hormone could effectively prevent ovulation in both animals and humans, the investigators turned their attention back to birth control. They were faced with several problems: whether side effects might occur in women using progestins for a long time, and whether women would remember to take the pill day after day, for months or even years. To solve these problems, the birth control pill was tested on a large scale. Because of legal problems in the United States, Pincus decided to conduct the test in Puerto Rico. The test started in April of 1956. Edris Rice-Wray, a physician, was responsible for the day-to-day management of the project. As director of the Puerto Rico Family Planning Association, she had seen firsthand the need for a cheap, reliable contraceptive. The women she recruited for the study were married women from a low-income population living in a housing development in Río Piedras, a suburb of San Juan. Word spread quickly, and soon women were volunteering to take the pill that would prevent pregnancy. In the first study, 221 women took a pill containing 10 milligrams of progestin and 0.15 milligrams of estrogen. (The estrogen was added to help control breakthrough bleeding.) Results of the test were reported in 1957. Overall, the pill proved highly effective in preventing conception. None of the women who took the pill according to directions became pregnant, and most women who wanted to get pregnant after stopping the pill had no difficulty. Nevertheless, 17 percent of the women had some unpleasant reactions, such as nausea or dizziness. The scientists believed that these mild side effects, as well as one death from congestive heart failure, were unrelated to the use of the pill. Even before the final results were announced, additional field tests were begun. In 1960, the U.S. Food and Drug Administration (FDA) approved the use of the pill developed by Pincus and his collaborators as an oral contraceptive.Consequences Within two years of approval by the FDA, more than a million women in the United States were using the birth control pill. New contraceptives were developed in the 1960’s and 1970’s, but the birth control pill remains the most widely used method of preventing pregnancy. More than 60 million women use the pill worldwide. The greatest impact of the pill has been in the social and political world. Before Sanger began the push for the pill, birth control was regarded often as socially immoral and often illegal as well. Women in those post-World War II years were expected to have a lifelong career as a mother to their many children. With the advent of the pill, a radical change occurred in society’s attitude toward women’s work.Women had increased freedom to work and enter careers previously closed to them because of fears that they might get pregnant. Women could control more precisely when they would get pregnant and how many children they would have. The women’s movement of the 1960’s—with its change to more liberal social and sexual values—gained much of its strength from the success of the birth control pill.

BINAC computer

The invention: The world’s first electronic general-purpose digital computer. The people behind the invention: John Presper Eckert (1919-1995), an American electrical engineer John W. Mauchly (1907-1980), an American physicist John von Neumann (1903-1957), a Hungarian American mathematician Alan Mathison Turing (1912-1954), an English mathematician Computer Evolution In the 1820’s, there was a need for error-free mathematical and astronomical tables for use in navigation, unreliable versions of which were being produced by human “computers.” The problem moved English mathematician and inventor Charles Babbage to design and partially construct some of the earliest prototypes of modern computers, with substantial but inadequate funding from the British government. In the 1880’s, the search by the U.S. Bureau of the Census for a more efficient method of compiling the 1890 census led American inventor Herman Hollerith to devise a punched-card calculator, a machine that reduced by several years the time required to process the data. The emergence of modern electronic computers began during World War II (1939-1945), when there was an urgent need in the American military for reliable and quickly produced mathematical tables that could be used to aim various types of artillery. The calculation of very complex tables had progressed somewhat since Babbage’s day, and the human computers were being assisted by mechanical calculators. Still, the growing demand for increased accuracy and efficiency was pushing the limits of these machines. Finally, in 1946, following three years of intense work at the University of Pennsylvania’s Moore School of Engineering, John Presper Eckert and John W. Mauchly presented their solution to the problems in the form of the Electronic Numerical Integrator and Calculator (ENIAC) the world’s first electronic general-purpose digital computer. The ENIAC, built under a contract with the Army’s Ballistic Research Laboratory, became a great success for Eckert and Mauchly, but even before it was completed, they were setting their sights on loftier targets. The primary drawback of the ENIAC was the great difficulty involved in programming it. Whenever the operators needed to instruct the machine to shift from one type of calculation to another, they had to reset a vast array of dials and switches, unplug and replug numerous cables, and make various other adjustments to the multiple pieces of hardware involved. Such a mode of operation was deemed acceptable for the ENIAC because, in computing firing tables, it would need reprogramming only occasionally. Yet if instructions could be stored in a machine’s memory, along with the data, such a machine would be able to handle a wide range of calculations with ease and efficiency. The Turing Concept The idea of a stored-program computer had first appeared in a paper published by English mathematician Alan Mathison Turing in 1937. In this paper, Turing described a hypothetical machine of quite simple design that could be used to solve a wide range of logical and mathematical problems. One significant aspect of this imaginary Turing machine was that the tape that would run through it would contain both information to be processed and instructions on how to process it. The tape would thus be a type of memory device, storing both the data and the program as sets of symbols that the machine could “read” and understand. Turing never attempted to construct this machine, and it was not until 1946 that he developed a design for an electronic stored-program computer, a prototype of which was built in 1950. In the meantime, John von Neumann, a Hungarian American mathematician acquainted with Turing’s ideas, joined Eckert and Mauchly in 1944 and contributed to the design of ENIAC’s successor, the Electronic Discrete Variable Automatic Computer (EDVAC), another project financed by the Army. The EDVAC was the first computer designed to incorporate the concept of the stored program.In March of 1946, Eckert and Mauchly, frustrated by a controversy over patent rights for the ENIAC, resigned from the Moore School. Several months later, they formed the Philadelphiabased Electronic Control Company on the strength of a contract from the National Bureau of Standards and the Census Bureau to build a much grander computer, the Universal Automatic Computer (UNIVAC). They thus abandoned the EDVAC project, which was finally completed by the Moore School in 1952, but they incorporated the main features of the EDVAC into the design of the UNIVAC. Building the UNIVAC, however, proved to be much more involved and expensive than anticipated, and the funds provided by the original contract were inadequate. Eckert and Mauchly, therefore, took on several other smaller projects in an effort to raise funds. On October 9, 1947, they signed a contract with the Northrop Corporation of Hawthorne, California, to produce a relatively small computer to be used in the guidance system of a top-secret missile called the Snark, which Northrop was building for the Air Force. This computer, the Binary Automatic Computer (BINAC), turned out to be Eckert and Mauchly’s first commercial sale and the first stored-program computer completed in the United States. The BINAC was designed to be at least a preliminary version of a compact, airborne computer. It had two main processing units. These contained a total of fourteen hundred vacuum tubes, a drastic reduction from the eighteen thousand used in the ENIAC. There were also two memory units, as well as two power supplies, an input converter unit, and an input console, which used either a typewriter keyboard or an encoded magnetic tape (the first time such tape was used for computer input). Because of its dual processing, memory, and power units, the BINAC was actually two computers, each of which would continually check its results against those of the other in an effort to identify errors. The BINAC became operational in August, 1949. Public demonstrations of the computer were held in Philadelphia from August 18 through August 20.Impact The design embodied in the BINAC is the real source of its significance. It demonstrated successfully the benefits of the dual processor design for minimizing errors, a feature adopted in many subsequent computers. It showed the suitability of magnetic tape as an input-output medium. Its most important new feature was its ability to store programs in its relatively spacious memory, the principle that Eckert, Mauchly, and von Neumann had originally designed into the EDVAC. In this respect, the BINAC was a direct descendant of the EDVAC. In addition, the stored-program principle gave electronic computers new powers, quickness, and automatic control that, as they have continued to grow, have contributed immensely to the aura of intelligence often associated with their operation. The BINAC successfully demonstrated some of these impressive new powers in August of 1949 to eager observers from a number of major American corporations. It helped to convince many influential leaders of the commercial segment of society of the promise of electronic computers. In doing so, the BINAC helped to ensure the further evolution of computers. See also Apple II computer; BINAC computer; Colossus computer; ENIAC computer; IBM Model 1401 computer; Personal computer; Supercomputer; UNIVAC computer.

Bathysphere

The invention: The first successful chamber for manned deep-sea diving missions. The people behind the invention: William Beebe (1877-1962), an American naturalist and curator of ornithology Otis Barton (1899- ), an American engineer John Tee-Van (1897-1967), an American general associate with the New York Zoological Society Gloria Hollister Anable (1903?-1988), an American research associate with the New York Zoological Society Inner Space Until the 1930’s, the vast depths of the oceans had remained largely unexplored, although people did know something of the ocean’s depths. Soundings and nettings of the ocean bottom had been made many times by a number of expeditions since the 1870’s. Diving helmets had allowed humans to descend more than 91 meters below the surface, and the submarine allowed them to reach a depth of nearly 120 meters. There was no firsthand knowledge, however, of what it was like in the deepest reaches of the ocean: inner space. The person who gave the world the first account of life at great depths wasWilliam Beebe. When he announced in 1926 that he was attempting to build a craft to explore the ocean, he was already a well-known naturalist. Although his only degrees had been honorary doctorates, he was graduated as a special student in the Department of Zoology of Columbia University in 1898. He began his lifelong association with the New York Zoological Society in 1899. It was during a trip to the Galápagos Islands off the west coast of South America that Beebe turned his attention to oceanography. He became the first scientist to use a diving helmet in fieldwork, swimming in the shallow waters. He continued this shallow-water work at the new station he established in 1928, with the permission of English authorities, on the tiny island of Nonesuch in the Bermudas. Beebe realized, however, that he had reached the limits of the current technology and that to study the animal life of the ocean depths would require a new approach. A New Approach While he was considering various cylindrical designs for a new deep-sea exploratory craft, Beebe was introduced to Otis Barton. Barton, a young New Englander who had been trained as an engineer at Harvard University, had turned to the problems of ocean diving while doing postgraduate work at Columbia University. In December, 1928, Barton brought his blueprints to Beebe. Beebe immediately saw that Barton’s design was what he was looking for, and the two went ahead with the construction of Barton’s craft. The “bathysphere,” as Beebe named the device, weighed 2,268 kilograms and had a diameter of 1.45 meters and steel walls 3.8 centimeters thick. The door, weighing 180 kilograms, would be fastened over a manhole with ten bolts. Four windows, made of fused quartz, were ordered from the General Electric Company at a cost of $500 each. A 250-watt water spotlight lent by the Westinghouse Company provided the exterior illumination, and a telephone lent by the Bell Telephone Laboratory provided a means of communicating with the surface. The breathing apparatus consisted of two oxygen tanks that allowed 2 liters of oxygen per minute to escape into the sphere. During the dive, the carbon dioxide and moisture were removed, respectively, by trays containing soda lime and calcium chloride. A winch would lower the bathysphere on a steel cable. In early July, 1930, after several test dives, the first manned dive commenced. Beebe and Barton descended to a depth of 244 meters. A short circuit in one of the switches showered them with sparks momentarily, but the descent was largely a success. Beebe and Barton had descended farther than any human. Two more days of diving yielded a final dive record of 435 meters below sea level. Beebe and the other members of his staff (ichthyologist John Tee-Van and zoologist Gloria Hollister Anable) saw many species of fish and other marine life that previously had been seen only after being caught in nets. These first dives proved that an undersea exploratory craft had potential value, at least for deep water. After 1932, the bathysphere went on display at the Century of Progress Exhibition in Chicago. In late 1933, the National Geographic Society offered to sponsor another series of dives. Although a new record was not a stipulation, Beebe was determined to supply one. The bathysphere was completely refitted before the new dives. An unmanned test dive to 920 meters was made on August 7, 1934, once again off Nonesuch Island. Minor adjustments were made, and on the morning of August 11, the first dive commenced, attaining a depth of 765 meters and recording a number of new scientific observations. Several days later, on August 15, the weather was again right for the dive. This dive also paid rich dividends in the number of species of deep-sea life observed. Finally, with only a few turns of cable left on the winch spool, the bathysphere reached a record depth of 923 meters— almost a kilometer below the ocean’s surface.Impact Barton continued to work on the bathysphere design for some years. It was not until 1948, however, that his new design, the benthoscope, was finally constructed. It was similar in basic design to the bathysphere, though the walls were increased to withstand greater pressures. Other improvements were made, but the essential strengths and weaknesses remained. On August 16, 1949, Barton, diving alone, broke the record he and Beebe had set earlier, reaching a depth of 1,372 meters off the coast of Southern California. The bathysphere effectively marked the end of the tethered exploration of the deep, but it pointed the way to other possibilities. The first advance in this area came in 1943, when undersea explorer Jacques-Yves Cousteau and engineer Émile Gagnan developed the Aqualung underwater breathing apparatus, which made possible unfettered and largely unencumbered exploration down to about 60 meters. This was by no means deep diving, but it was clearly a step along the lines that Beebe had envisioned for underwater research. A further step came in the development of the bathyscaphe by 102 / Bathysphere Auguste Piccard, the renowned Swiss physicist, who, in the 1930’s, had conquered the stratosphere in high-altitude balloons. The bathyscaphe was a balloon that operated in reverse. Aspherical steel passenger cabin was attached beneath a large float filled with gasoline for buoyancy. Several tons of iron pellets held by electromagnets acted as ballast. The bathyscaphe would sink slowly to the bottom of the ocean, and when its passengers wished to return, the ballast would be dumped. The craft would then slowly rise to the surface. On September 30, 1953, Piccard touched bottom off the coast of Italy, some 3,000 meters below sea level.

Bathyscaphe

The invention: A submersible vessel capable of exploring the deepest trenches of the world’s oceans. The people behind the invention: William Beebe (1877-1962), an American biologist and explorer Auguste Piccard (1884-1962), a Swiss-born Belgian physicist Jacques Piccard (1922- ), a Swiss ocean engineer Early Exploration of the Deep Sea The first human penetration of the deep ocean was made byWilliam Beebe in 1934, when he descended 923 meters into the Atlantic Ocean near Bermuda. His diving chamber was a 1.5-meter steel ball that he named Bathysphere, from the Greek word bathys (deep) and the word sphere, for its shape. He found that a sphere resists pressure in all directions equally and is not easily crushed if it is constructed of thick steel. The bathysphere weighed 2.5 metric tons. It had no buoyancy and was lowered from a surface ship on a single 2.2-centimeter cable; a broken cable would have meant certain death for the bathysphere’s passengers. Numerous deep dives by Beebe and his engineer colleague, Otis Barton, were the first uses of submersibles for science. Through two small viewing ports, they were able to observe and photograph many deep-sea creatures in their natural habitats for the first time. They also made valuable observations on the behavior of light as the submersible descended, noting that the green surface water became pale blue at 100 meters, dark blue at 200 meters, and nearly black at 300 meters. A technique called “contour diving” was particularly dangerous. In this practice, the bathysphere was slowly towed close to the seafloor. On one such dive, the bathysphere narrowly missed crashing into a coral crag, but the explorers learned a great deal about the submarine geology of Bermuda and the biology of a coral-reef community. Beebe wrote several popular and scientific books about his adventures that did much to arouse interest in the ocean. Testing the Bathyscaphe The next important phase in the exploration of the deep ocean was led by the Swiss physicist Auguste Piccard. In 1948, he launched a new type of deep-sea research craft that did not require a cable and that could return to the surface by means of its own buoyancy. He called the craft a bathyscaphe, which is Greek for “deep boat.” Piccard began work on the bathyscaphe in 1937, supported by a grant from the Belgian National Scientific Research Fund. The German occupation of Belgium early in World War II cut the project short, but Piccard continued his work after the war. The finished bathyscaphe was named FNRS 2, for the initials of the Belgian fund that had sponsored the project. The vessel was ready for testing in the fall of 1948. The first bathyscaphe, as well as later versions, consisted of two basic components: first, a heavy steel cabin to accommodate observers, which looked somewhat like an enlarged version of Beebe’s bathysphere; and second, a light container called a float, filled with gasoline, that provided lifting power because it was lighter than water. Enough iron shot was stored in silos to cause the vessel to descend. When this ballast was released, the gasoline in the float gave the bathyscaphe sufficient buoyancy to return to the surface. Piccard’s bathyscaphe had a number of ingenious devices. Jacques- Yves Cousteau, inventor of the Aqualung six years earlier, contributed a mechanical claw that was used to take samples of rocks, sediment, and bottom creatures. A seven-barreled harpoon gun, operated by water pressure, was attached to the sphere to capture specimens of giant squids or other large marine animals for study. The harpoons had electrical-shock heads to stun the “sea monsters,” and if that did not work, the harpoon could give a lethal injection of strychnine poison. Inside the sphere were various instruments for measuring the deep-sea environment, including a Geiger counter for monitoring cosmic rays. The air-purification system could support two people for up to twenty-four hours. The bathyscaphe had a radar mast to broadcast its location as soon as it surfaced. This was essential because there was no way for the crew to open the sphere from the inside.The FNRS 2 was first tested off the Cape Verde Islands with the assistance of the French navy. Although Piccard descended to only 25 meters, the dive demonstrated the potential of the bathyscaphe. On the second dive, the vessel was severely damaged by waves, and further tests were suspended. Aredesigned and rebuilt bathyscaphe, renamed FNRS 3 and operated by the French navy, descended to a depth of 4,049 meters off Dakar, Senegal, on the west coast of Africa in early 1954. In August, 1953, Auguste Piccard, with his son Jacques, launched a greatly improved bathyscaphe, the Trieste, which they named for the Italian city in which it was built. In September of the same year, the Trieste successfully dived to 3,150 meters in the Mediterranean Sea. The Piccards glimpsed, for the first time, animals living on the seafloor at that depth. In 1958, the U.S. Navy purchased the Trieste and transported it to California, where it was equipped with a new cabin designed to enable the vessel to reach the seabed of the great oceanic trenches. Several successful descents were made in the Pacific by Jacques Piccard, and on January 23, 1960, Piccard, accompanied by Lieutenant DonaldWalsh of the U.S. Navy, dived a record 10,916 meters to the bottom of the Mariana Trench near the island of Guam. Impact The oceans have always raised formidable barriers to humanity’s curiosity and understanding. In 1960, two events demonstrated the ability of humans to travel underwater for prolonged periods and to observe the extreme depths of the ocean. The nuclear submarine Triton circumnavigated the world while submerged, and Jacques Piccard and Lieutenant Donald Walsh descended nearly 11 kilometers to the bottom of the ocean’s greatest depression aboard the Trieste. After sinking for four hours and forty-eight minutes, the Trieste landed in the Challenger Deep of the Mariana Trench, the deepest known spot on the ocean floor. The explorers remained on the bottom for only twenty minutes, but they answered one of the biggest questions about the sea: Can animals live in the immense cold and pressure of the deep trenches? Observations of red shrimp and flatfishes proved that the answer was yes. The Trieste played another important role in undersea exploration when, in 1963, it located and photographed the wreckage of the nuclear submarine Thresher. The Thresher had mysteriously disappeared on a test dive off the New England coast, and the Navy had been unable to find a trace of the lost submarine using surface vessels equipped with sonar and remote-control cameras on cables. Only the Trieste could actually search the bottom. On its third dive, the bathyscaphe found a piece of the wreckage, and it eventually photographed a 3,000-meter trail of debris that led to Thresher‘s hull, at a depth of 2.5 kilometers.These exploits showed clearly that scientific submersibles could be used anywhere in the ocean. Piccard’s work thus opened the last geographic frontier on Earth.

BASIC programming language

The invention: An interactive computer system and simple programming language that made it easier for nontechnical people to use computers. The people behind the invention: John G. Kemeny (1926-1992), the chairman of Dartmouth’s mathematics department Thomas E. Kurtz (1928- ), the director of the Kiewit Computation Center at Dartmouth Bill Gates (1955- ), a cofounder and later chairman of the board and chief operating officer of the Microsoft Corporation The Evolution of Programming The first digital computers were developed duringWorldWar II (1939-1945) to speed the complex calculations required for ballistics, cryptography, and other military applications. Computer technology developed rapidly, and the 1950’s and 1960’s saw computer systems installed throughout the world. These systems were very large and expensive, requiring many highly trained people for their operation. The calculations performed by the first computers were determined solely by their electrical circuits. In the 1940’s, The American mathematician John von Neumann and others pioneered the idea of computers storing their instructions in a program, so that changes in calculations could be made without rewiring their circuits. The programs were written in machine language, long lists of zeros and ones corresponding to on and off conditions of circuits. During the 1950’s, “assemblers” were introduced that used short names for common sequences of instructions and were, in turn, transformed into the zeros and ones intelligible to the computer. The late 1950’s saw the introduction of high-level languages, notably Formula Translation (FORTRAN), CommonBusinessOriented Language (COBOL), and Algorithmic Language (ALGOL), which used English words to communicate instructions to the computer. Unfortunately, these high-level languages were complicated; they required some knowledge of the computer equipment and were designed to be used by scientists, engineers, and other technical experts. Developing BASIC John G. Kemeny was chairman of the department of mathematics at Dartmouth College in Hanover, New Hampshire. In 1962, Thomas E. Kurtz, Dartmouth’s computing director, approached Kemeny with the idea of implementing a computer system at Dartmouth College. Both men were dedicated to the idea that liberal arts students should be able to make use of computers. Although the English commands of FORTRAN and ALGOL were a tremendous improvement over the cryptic instructions of assembly language, they were both too complicated for beginners. Kemeny convinced Kurtz that they needed a completely new language, simple enough for beginners to learn quickly, yet flexible enough for many different kinds of applications. The language they developed was known as the “Beginner’s Allpurpose Symbolic Instruction Code,” or BASIC. The original language consisted of fourteen different statements. Each line of a BASIC program was preceded by a number. Line numbers were referenced by control flow statements, such as, “IF X = 9 THEN GOTO 200.” Line numbers were also used as an editing reference. If line 30 of a program contained an error, the programmer could make the necessary correction merely by retyping line 30. Programming in BASIC was first taught at Dartmouth in the fall of 1964. Students were ready to begin writing programs after two hours of classroom lectures. By June of 1968, more than 80 percent of the undergraduates at Dartmouth could write a BASIC program. Most of them were not science majors and used their programs in conjunction with other nontechnical courses. Kemeny and Kurtz, and later others under their supervision, wrote more powerful versions of BASIC that included support for graphics on video terminals and structured programming. The creators of BASIC, however, always tried to maintain their original design goal of keeping BASIC simple enough for beginners. Consequences Kemeny and Kurtz encouraged the widespread adoption of BASIC by allowing other institutions to use their computer system and by placing BASIC in the public domain. Over time, they shaped BASIC into a powerful language with numerous features added in response to the needs of its users. What Kemeny and Kurtz had not foreseen was the advent of the microprocessor chip in the early 1970’s, which revolutionized computer technology. By 1975, microcomputer kits were being sold to hobbyists for well under a thousand dollars. The earliest of these was the Altair. That same year, prelaw studentWilliam H. Gates (1955- ) was persuaded by a friend, Paul Allen, to drop out of Harvard University and help create a version of BASIC that would run on the Altair. Gates and Allen formed a company, Microsoft Corporation, to sell their BASIC interpreter, which was designed to fit into the tiny memory of the Altair. It was about as simple as the original Dartmouth BASIC but had to depend heavily on the computer hardware. Most computers purchased for home use still include a version of Microsoft Corporation’s BASIC. See also BINAC computer; COBOL computer language; FORTRAN programming language; SAINT; Supercomputer.