Pole pieces for same magnet altering to annular ga

Pole pieces for same magnet altering to annular gap approximately 3 7/8" to 3 5/16", part of Oliver Lodge’s microphone amplifier or relay, 1898 (British patent 9712 of 1898) ), a precursor of the moving-coil loudspeaker

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Science Museum: Making the Modern World Gallery

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Details

Category:
Radio Communication
Object Number:
1926-713
credit:
Sir Oliver Lodge.

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