Marconi-Reis transverse-current carbon microphone

Made:
1925-1935 in United Kingdom
Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British, Front: Rear view of Reisz microphone. Marconi-Reisz transverse-current carbon microphone
      
      Back: Front view of Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British, Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British, Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British,

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Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Front: Rear view of Reisz microphone. Marconi-Reisz transverse-current carbon microphone Back: Front view of
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Marconi-Reisz transverse-current carbon microphone, invented by Georg Neumann, unknown maker, British,
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)
type:
microphone
credit:
Donated by the British Broadcasting Corporation.