Word: diaphragm
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Dates: during 1890-1899
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...known as the magneto telephone, which consisted of an electro magnet at each end of the line in front of which were placed armatures. When one of these armatures was vibrated the same vibrations were observed in the other. Mr. Bell then found that by means of a small diaphragm he could transmit the sound waves made by the voice to a diaphragm at the other end of the line. He now gave all his attention to perfecting this diaphragm transmitter and in 1877 brought it to the familiar form in which it has remained ever since. When the magneto...