Filings coherer, Lodge-Muirhead system, patented 1

Filings coherer, Lodge-Muirhead system, patented 1901, with arrangement for adjusting the compression of filings by using an external magnet to turn the head of a screw inside the tube. Adjustment washer inside the tube marked in handwriting ‘Dec 31 1902’.

Details

Category:
Radio Communication
Identifier:
1923-442
credit:
Northampton Polytechnic Institute
status:
Permanent collection

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