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Chemical Telephone
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Description: 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.
Source: J. G. Holland Scribner's Monthly, An illustrated Magazine For the People (New York : Scribner and Co., 1876) XVIII:303
Keywords: chemical telephone, crank, early, phone
Copyright: 2009, Florida Center for Instructional Technology. See license.
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