. Bulletin. Science. Figure 57.—Gray's telegraph for transmitting musical tones, 1875. A single receiver could respond to any frequency over a broad range. From patent 166095 (July 27, 1875). telegraph vt'ire, then so could the human voice. At first he tried to devise an instrument capable of separately reproducing each of the most common tones of the human voice. This was necessarily a difficult task because a diflferent unit was contem- plated for each of the main parts of human speech. Late in 1875, however. Gray came upon the so-called "lover's telegraph," which consisted of
. Bulletin. Science. Figure 57.—Gray's telegraph for transmitting musical tones, 1875. A single receiver could respond to any frequency over a broad range. From patent 166095 (July 27, 1875). telegraph vt'ire, then so could the human voice. At first he tried to devise an instrument capable of separately reproducing each of the most common tones of the human voice. This was necessarily a difficult task because a diflferent unit was contem- plated for each of the main parts of human speech. Late in 1875, however. Gray came upon the so-called "lover's telegraph," which consisted of a short cylinder of metal or wood that was open at one end and had a membrane across the other end. The centers of the membranes of two such instruments were connected by a taut wire. When a person spoke into one cylinder, the speech could be heard in the other. This device showed Gray that the vibrating diaphragm receiver he had already invented (fig. 57) should be capable of repeating speech transmitted to it, and that consequently part of his task had already been accomplished. He had only to devise a trans- mitter, which he did a short time later. The transmitter that Gray designed was a cylinder, at one end of which was a diaphragm with a light metal wire fastened to the side facing away from the cylinder. The cylinder was placed over a container PAPER 29: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: II 317. 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
Size: 1581px × 1581px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
