ballast tube
date: label: date made
content: ca 1915
notes: label: Description (Brief)
content: No base. Two lead wires emerge from the bottom. Two spiral tungsten filaments wired in electrical parallel and arranged so that there are four parallel filament legs. Crimp connectors, ceramic mount in top, asbestos lead insulator. Tipped T-shaped envelope, blackened by use. No extant maker's marks.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Susan Horle
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.314097
label: catalog number
content: 314097
label: accession number
content: 195337
objectType: label: Object Name
content: Tube, Ballast
label: Object Name
content: resistance
label: Object Name
content: incandescent lamp, diode
label: Object Name
content: diode
label: Other Terms
content: Tube, Ballast; Resistance
physicalDescription: label: Measurements
content: overall: 2 1/4 in x 3/4 in; 5.715 cm x 1.905 cm