The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action (1877)
Dolbear, A[mos] E[merson], 1837- [from old catalog] · Boston, Lee & Shepard; New York, C. T. Dillingham · leaf 109
at-tempts was made by Philip Reiss of Friedrichs-dorf, Germany, in 1861. His apparatus consisted of a hollow box, withtwo apertures : one in front, in which was in-serted a short tube for producing the sound in,and indicated by the arrow in the cut, Fig. 12; 104 THETELEPHONE. the other on the top.… … to a screw-cup from which another wire went to abattery. A platinum finger, S, rested upon the strip ofplatinum, but was made fast at one end to thescrew cup that connected with the other wire fromthe battery. Now, when a sound is made in thebox, the membrane is made to vibrate powerfully:this…
Telephone
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