unidentified experimental vacuum tube
notes: label: Description (Brief)
content: Marked: "34695" on envelope, "7D" on stem press. No base, four cloth insulated leads, tipped T-shaped envelope, with two wire filaments. One filament (carbon?) set horizontally between two carbon-paste connectors, and shows a small deposit in the center. The other filament is a single arch (or possibly two half-filament electrodes) set in crimp connectors perpendicular to the horizontal filament. The break in the arch occurs on either side of the deposit on the horizontal filament.
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.322532
label: catalog number
content: 322532
label: accession number
content: 241556
objectType: label: Object Name
content: vacuum tube
physicalDescription: label: Measurements
content: overall: 2 in x 3/4 in; 5.08 cm x 1.905 cm