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4 Volt Fleming Oscillation Valve, by Royal Ediswan, London, c. 1905

Inventory Number: 21763

21763-1t 21763-2t

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.


4 Volt Fleming Oscillation Valve, with bayonet fitting, anode connecting wire and brass base.

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