Western Electric type 117-A ballast lamp
date: label: date made
content: ca 1930
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: Brass medium screw base with glass insulator, tungsten filament, T-shaped envelope. Stamped: "26437". Donor’s card reads: “Ballast lamp made by the Western Electric Company about 1930 for use in telephone circuits. This lamp is intended to keep a nearly constant current of .49 ampere within its normal voltage range, from 3 to 10 volts.”
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.325195
label: catalog number
content: 325195
label: accession number
content: 252994
objectType: label: Object Name
content: Ballast
label: Object Name
content: resistance
label: Object Type
content: ballast
label: Other Terms
content: Ballast; Resistance
physicalDescription: label: Measurements
content: overall: 3 3/8 in x 1 1/4 in; 8.5725 cm x 3.175 cm