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Sykes Microphone, by Sykes, England, 1923
Inventory Number: 56738
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Historical Background
Text:
Denman (No. 175) records that this is the Sykes microphone that was used for broadcasting before Round's improved version was standardised in London and other broadcasting stations in 1923.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
"An extremely light flat spiral spring is used as the moving element. This coil is suspended in the annular air-gap of the electro-magnet, and alternating current of acoustic frequency are set up in this coil by its own to-and-fro movement caused by acoustic vibration." (Denman)
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