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4 Volt Fleming Oscillation Valve, by Royal Ediswan, London, c. 1905
Inventory Number: 21763
Date: c. 1905
Maker Details: Signed by Royal Ediswan.
Inscription: "ROYAL EDISWAN / 'FLEMING OSCILLATION VALVE' / 4 VOLTS." stamped on exterior surface of bulb.
Size: 70 mm in overall length
Materials: Brass, glass, assorted metals.
Other Given Number(s): Christie's 193, Science Museum Loan 1924-488.
Notes:
4 Volt Fleming Oscillation Valve, with bayonet fitting, anode connecting wire and brass base.
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