Scottish-born American inventor and teacher of the deaf, Alexander Graham Bell (1847-1922) is best known for perfecting the telephone to transmit vocal messages by electricity. The telephone inaugurated a new age in communication technology.
Alexander Graham Bell was born on March 3, 1847, in Edinburgh. His father, Alexander Melville Bell, was an expert in vocal physiology and elocution; his grandfather, Alexander Bell, was an elocution professor.
After studying at the University of Edinburgh and University College, London, Bell became his father's assistant. He taught the deaf to talk by adopting his father's system of visible speech (illustrations of speaking positions of the lips and tongue). In London he studied Hermann Ludwig von Helmholtz's experiments with tuning forks and magnets to produce complex sounds. In 1865 Bell made scientific studies of the resonance of the mouth while speaking.
In 1870 the Bells moved to Brantford, Ontario, Canada, to preserve Alexander's health. He went to Boston in 1871 to teach at Sarah Fuller's School for the Deaf, the first such school in the world. He also tutored private students, including Helen Keller. As professor of vocal physiology and speech at Boston University in 1873, he initiated conventions for teachers of the deaf. Throughout his life he continued to educate the deaf, and he founded the American Association to Promote the Teaching of Speech to the Deaf.
From 1873 to 1876 Bell experimented with a phonautograph, a multiple telegraph, and an electric speaking telegraph (the telephone). Funds came from the fathers of two of his pupils; one of these men, Gardiner Hubbard, had a deaf daughter, Mabel, who later became Bell's wife.
To help deaf children, Bell experimented in the summer of 1874 with a human ear and attached bones, a tympanum, magnets, and smoked glass. He conceived the theory of the telephone: an electric current can be made to change intensity precisely as air density varies during sound production. Unlike the telegraph's use of intermittent current, the telephone requires continuous current with varying intensity. That same year he invented a harmonic telegraph, to transmit several messages simultaneously over one wire, and a telephonic-telegraphic receiver. Trying to reproduce the human voice electrically, he became expert with electric wave transmission.
Bell supplied the ideas; Thomas Watson made and assembled the equipment. Working with tuned reeds and magnets to synchronize a receiving instrument with a sender, they transmitted a musical note on June 2, 1875. Bell's telephone receiver and transmitter were identical: a thin disk in front of an electromagnet.
On Feb. 14, 1876, Bell's attorney filed for a patent. The exact hour was not recorded, but on that same day Elisha Gray filed his caveat (intention to invent) for a telephone. The U.S. Patent Office granted Bell the patent for the "electric speaking telephone" on March 7. It was the most valuable single patent ever issued, and it opened a new age in communication technology.
Bell continued his experiments to improve the telephone's quality. By accident, Bell sent the first sentence, "Watson, come here; I want you, " on March 10, 1876. The first demonstration occurred at the American Academy of Arts and Sciences convention in Boston 2 months later. Bell's display at the Philadelphia Centennial Exposition a month later gained more publicity, and Emperor Dom Pedro of Brazil ordered 100 telephones for his country. The telephone, accorded only 18 words in the official catalog of the exposition, suddenly became the "star" attraction.
Repeated demonstrations overcame public skepticism. The first reciprocal outdoor conversation was between Boston and Cambridge, Mass., by Bell and Watson on Oct. 9, 1876. In 1877 the first telephone was installed in a private home; a conversation was conducted between Boston and New York, using telegraph lines; in May, the first switchboard, devised by E. T. Holmes in Boston, was a burglar alarm connecting five banks; and in July the first organization to commercialize the invention, the Bell Telephone Company, was formed. That year, while on his honeymoon, Bell introduced the telephone to England and France.
The first commercial switchboard was set up in New Haven, Conn., in 1878, and Bell's first subsidiary, the New England Telephone Company, was organized that year. Switchboards were improved by Charles Scribner, with more than 500 inventions. Thomas Cornish, a Philadelphia electrician, had a switchboard for eight customers and published a one-page directory in 1878.
Other inventors had been at work. Between 1867 and 1873 Professor Elisha Gray (of Oberlin College) invented an "automatic self-adjusting telegraph relay, " installed it in hotels, and made telegraph printers and repeaters. He tried to perfect a speaking telephone from his harmonic (multiple-current) telegraph. The Gray and Batton Manufacturing Company of Chicago developed into the Western Electric Company.
Another competitor was Professor Amos E. Dolbear, who insisted that Bell's telephone was only an improvement on an 1860 invention by Johann Reis, a German, who had experimented with pigs' ear membranes and may have made a telephone. Dolbear's own instrument, operating by "make and break" current, could transmit pitch but not voice quality.
In 1879 Western Union, with its American Speaking Telephone Company, ignored Bell's patents and hired Thomas Edison, along with Dolbear and Gray, as inventors and improvers. Later that year Bell and Western Union formed a joint company, with the latter getting 20 percent for providing wires, circuits, and equipment. Theodore Vail, organizer of Bell Telephone Company, consolidated six companies in 1881. The modern transmitter evolved mainly from the work of Emile Berliner and Edison in 1877 and Francis Blake in 1878. Blake's transmitter was later sold to Bell for stock.
The claims of other inventors were contested. Daniel Drawbaugh, from rural Pennsylvania, with little formal schooling, almost won a legal battle with Bell in 1884 but was defeated by a 4 to 3 vote in the Supreme Court. The claim by this "Edison of the Cumberland Valley" was the most exciting (and futile) litigation over telephone patents. Altogether, the Bell Company was involved in 587 lawsuits, of which 5 went to the Supreme Court; Bell won every case. A convincing argument was that no competitor claimed originality until 17 months after Bell's patent. Also, at the 1876 Philadelphia Exposition, eminent electrical scientists, especially Lord Kelvin, the world's foremost authority, had declared it to be "new." Professors, scientists, and researchers defended Bell, pointing to his lifelong study of the ear and his books and lectures on speech mechanics.
The Bell Company built the first long-distance line in 1884, connecting Boston and New York. The American Telephone and Telegraph Company was organized by Bell and others in 1885 to operate other long-distance lines. By 1889, when insulation was perfected, there were 11, 000 miles of underground wires in New York City.
The Volta Laboratory was started by Bell in Washington, D.C., with the Volta Prize money (50, 000 francs, about $10, 000) awarded by France for his invention. At the laboratory he and associates worked on various projects during the 1880s, including the photophone, induction balance, audiometer, and phonograph improvements. The photophone transmitted speech by light, using a primitive photoelectric cell. The induction balance (electric probe) located metal in the body. The audiometer indicated Bell's continued interest in deafness. The first successful phonograph record, a shellac cylinder, as well as wax disks and cylinders, was produced. The Columbia Gramophone Company exploited Bell's phonograph records. With the profits Bell established the Volta Bureau in Washington to study deafness.
Other activities took much time. The magazine Science (later the official organ of the American Association for the Advancement of Science) was founded in 1880 because of Bell's efforts. He made numerous addresses and published many monographs. As National Geographic Society president from 1896 to 1904, he fostered the success of the society and its publications. In 1898 he became a regent of the Smithsonian Institution. He was also involved in sheep breeding, hydrodynamics, and aviation projects.
Aviation was Bell's primary interest after 1895. He aided Samuel Langley, invented the tetrahedral kite (1903), and founded the Aerial Experiment Association (1907), bringing together Glenn Curtiss, Francis Baldwin, and others. They devised the aileron control principle (which replaced "wing warping"), developed the hydroplane, and solved balance problems in flying machines. Curtiss furnished the motor for Bell's man-carrying kite in 1907.
Bell died at Baddeck, Nova Scotia, on Aug. 2, 1922.
Catherine D. MacKenzie, Alexander Graham Bell (1928), is interesting and contains much personal information. Thomas Bertram Costain, Chord of Steel (1960), a recent history of the telephone, discusses Bell at length. Herbert Casson, The History of the Telephone (1910), is still useful for the early story. See also Arthur Pound, The Telephone Idea: Fifty Years After (1926), and Frederick Leland Rhodes, Beginnings of Telephony (1929). For the story of Bell's persistent rival see Warren J. Harder, Daniel Drawbaugh (1960).