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Osram-GEC Radio Valve Type R4, by Osram-GEC, English, c. 1916

preview image for Osram-GEC Radio Valve Type R4, by Osram-GEC, English, c. 1916
Inventory Number: 59017
Object Type:
Place Created: United Kingdom (England) Europe
Accession Number: 2004-9/196
Brief Description: Osram-GEC Soft Triode Radio Valve Type R4, with bulb-shaped glass exterior, brass fittings and a teak? mounting. With cylindrical anode threaded by helical grid with an interior single-strand wire filament, made of tungsten. In use filament would burn brightly similarly to a light bulb.
Primary Inscriptions: "OSRAM / G.E.C. / MADE IN / ENGLAND / R.4" stamped on one side of exterior surface of bulb. "VALVE / WIRELESS RECEIVING NO. R.4 / PATT. NO.4411 / A.7953" stamped on other side of exterior surface of bulb.
Provenance: Presented by the Marconi Corporation.
Collection Group: Marconi Collection
Material(s): Teak?
glass
brass
tungsten
assorted metals.
Cotton
Dimensions:
Height Width Depth Diameter Unit
90 80 50 mm

Narratives

Image with multimedia irn 39525Image with multimedia irn 39526

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