. Bulletin. Science. Figure 68.—Dolbear's first magneto telephone. From A. E. Dolbear, The Telephone, Boston, 1877. ^-^, :P'i^. Figure 6g.—Patent drawing of Berliner's telephone transmitter and receiver based upon a metal-to-metal contact. From patent 463569 (November 17, 1891). shouted, the signals transmitted were too weak to travel any great distance. Also, if the telephone line picked up a certain amount of extraneous noise— which it usually did, especially after the introduction of electrical power lines—the weak signals produced by the magneto transmitter were drowned out. Be
. Bulletin. Science. Figure 68.—Dolbear's first magneto telephone. From A. E. Dolbear, The Telephone, Boston, 1877. ^-^, :P'i^. Figure 6g.—Patent drawing of Berliner's telephone transmitter and receiver based upon a metal-to-metal contact. From patent 463569 (November 17, 1891). shouted, the signals transmitted were too weak to travel any great distance. Also, if the telephone line picked up a certain amount of extraneous noise— which it usually did, especially after the introduction of electrical power lines—the weak signals produced by the magneto transmitter were drowned out. Bell's transmitter was for these reasons too inefhcient for commercial use. If the Bell Company was to survive economically, another transmitter had to be found. At the end of 1877 the Western Union Telegraph Company formed, in competition with Bell and his associates, the Ajnerican Speaking Telephone Com- pany. Western Union had not only bought up the PAPER 29: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: II 325. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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