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BTH MICROPHONE, 1930's

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BTH MICROPHONE, 1930's

Carbon Granules are packed between two carbon rods in a chamber on which one side is a diaphragm of Mica sheet , sound waves move the sheet and subsequently the granules, varying an electric current passed between the electrodes.
Early Microphone probably used for Public Address systems.

Donated by Kenneth Thompson

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A1031



2007 The Museum of Technology, The Great War and WWII
Company registered in England No. 7452160, Registered Charity No. 1140352, Accredited Museum No. 2221