Experimental microphone

Experimental microphone consisting of a carbon block pressed

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Experimental microphone consisting of a carbon block pressed
Science Museum Group
© The Board of Trustees of the Science Musuem

Experimental microphone consisting of a carbon block pressed upon a steel rod by means of a spring

Details

Category:
Telecommunications
Object Number:
1922-143
type:
microphone
credit:
Executors of the late Anna C. Hughes