Marconi-Reis transverse-current carbon microphone

Made:
1925-1935 in United Kingdom
Marconi-Reisz transverse-current carbon microphone Marconi-Reisz transverse-current carbon microphone Marconi-Reis transverse-current carbon microphone (microphone) Marconi-Reisz transverse-current carbon microphone Marconi-Reisz transverse-current carbon microphone

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Creative Commons LicenseThis image is released under a CC BY-SA 4.0 Licence

Buy this image as a print 

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License this image for commercial use at Science and Society Picture Library

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Creative Commons LicenseThis image is released under a CC BY-SA 4.0 Licence

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Buy

License this image for commercial use at Science and Society Picture Library

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Creative Commons LicenseThis image is released under a CC BY-SA 4.0 Licence

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Marconi-Reisz transverse-current carbon microphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reis transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British, 1925-1935.

This was the BBC's standard microphone between 1926 and 1933. Within the heavy marble body of the microphone carbon granules fill a shallow space between electrodes placed along its shorter sides. As sound entered the microphone the sound waves compressed the carbon granules, affecting an electrical signal that could be transmitted by radio.

Details

Category:
Radio Communication
Object Number:
1949-131
Materials:
marble (limestone) and metal (unknown)
Measurements:
overall: 105 mm x 140 mm x 95 mm, 1.78kg
type:
microphone
credit:
Donated by the British Broadcasting Corporation.