Chemical Telephone

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An illustration of one of the early telephones, known as a chemical telephone. Some used a liquid transmitter, some had a metal diaphragm that induced current in an electromagnet wound around a permanent magnet, and some were “dynamic” - their diaphragm vibrated a coil of wire in the field of a permanent magnet or the coil vibrated the diaphragm.


J. G. Holland, ed. Scribner's Monthly, An illustrated Magazine For the People (New York, NY: Scribner and Company, 1876)


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