12 Volt Fleming Valve, by Royal Ediswan, London, c. 1905

Subject: Radio communication; Radio communication; Radio communication; Radio communication
Item type: Object
Makers: Royal Ediswan
Provenance: Presented by the Marconi Corporation.
Primary inscriptions: "ROYAL EDISWAN" stamped on one side of exterior surface of bulb. "FLEMING OSCILLATION VALVE / 12 VOLTS." stamped other side of exterior surface of bulb.
Physical material: Glass; brass?; assorted metals.
Object type: Radio valve
Dimensions: Diameter: 55mm Height: 100mm
Inventory No: 77499
Accession Number: 2004-9/182

Description

12 Volt Fleming Valve with bayonet fitting, anode connecting wire and brass? base.