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Marconi Sykes Microphone, by Marconi Company, London, c. 1923
Inventory Number: 79721
Number of documents: 1
Document Type: Miscellaneous Note
Document Heading: Inscription
Text:
"NOTICE. / VARIOUS PARTS OF THIS INSTALLATION, & / METHODS OF WORKING, ARE COVERED / BY PATENT Nos. 160,228, 186,658, AND / PATENTS APPLIED FOR, AND ARE / PATENTED IN MANY COUNTRIES. / MARCONI'S WIRELESS TELEGRAPH CO. LTD. / LONDON" printed on large brass plaque upon exterior surface of cylinder side. "+ - / MAGNET / COIL" etched on red ebonite block upon exterior surface of cylinder side. "MOVING / COIL" etched on black ebonite block upon exterior surface of cylinder side.
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