The telegraph in American and Morse memorial (1886)
Reid, James D · New York, Printed for the author by J. Polhemus · leaf 927
American Speaking Telephone Company, is entirelydifferent in principle from the magneto-electric systems of Gray andBell. It is based on the discovery that certain forms of carbon variesits resistance to the electric current by pressure. A diaphragm is madeto vibrate in front of a rod on the end of… … earth and the other with the line. Between the end of the rod and thediaphragm and resting on the diaphragm is a piece of cork Cand between the cork and platinumdisc is inserted a piece of rubber tube D. The usual mouthpiece B B surrounds the diaphragm.®S^**MiThe vibration of the diaphragm,causes…
Morse, Samuel Finley Breese, 1791-1872 · Telegraph
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