Osram Wireless type R2A receiving valve
date: label: date made
content: ca 1918
name: label: maker
content: Osram
notes: label: Description (Brief)
content: A gas triode used by the Royal (UK) Navy during WWI. In original box. A brass candelabra base with glass insulator, external wires lead to other end. Two cloth-insulated lead wires and the external wires are secured to the tube with a black ribbon. Stamped on envelope: "Valve / Wireless Receiving / R. 2A / Patt[ern]. No. 3987 / A 13788" and "Osram / G.E.C. / Made in / England / R. 2A". Reference: Tyne, "Saga of the Vacuum Tube," page 216.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321185
label: catalog number
content: 321185
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: vacuum tube
label: Object Name
content: triode
physicalDescription: label: Physical Description
content: cardboard (box material)
label: Measurements
content: tube: 3 1/2 in x 2 in; 8.89 cm x 5.08 cm
label: Measurements
content: box: 3 5/8 in x 2 3/4 in x 2 3/4 in; 9.2075 cm x 6.985 cm x 6.985 cm