. Bulletin. Science. Figure 73.—Reproduction of Hughes micro- phone. iUSNM 315083-4) telephone patents of inventors like Elisha Gray and Amos Dolbear =' (see fig. 68), but had hired Thomas A. Edison to invent a new transmitter. As will be seen below, the new American Speaking Telephone Company ceased giving competition to the Bell Company in 1880. Both the Bell Telephone Company and the West- ern Union Telegraph Company found a commer- cially practical transmitter in a device that modulated the current from a battery by varying the resistance of the circuit. The Bell Company obtained patent ri
. Bulletin. Science. Figure 73.—Reproduction of Hughes micro- phone. iUSNM 315083-4) telephone patents of inventors like Elisha Gray and Amos Dolbear =' (see fig. 68), but had hired Thomas A. Edison to invent a new transmitter. As will be seen below, the new American Speaking Telephone Company ceased giving competition to the Bell Company in 1880. Both the Bell Telephone Company and the West- ern Union Telegraph Company found a commer- cially practical transmitter in a device that modulated the current from a battery by varying the resistance of the circuit. The Bell Company obtained patent rights on such a transmitter from Emile Berliner and the Western Union Company from Edison. In the meantime other companies had also been formed to enter the telephone business and had applied for. 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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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
