Tungsten Filament Lamp
date: label: date made
content: ca 1908
name: label: maker
content: Heany, John Allen
label: maker
content: Heany Lamp Co.
notes: label: Description (Brief)
content: Heanysintered tungsten lamp, c1908. This tungsten lamp was at the heart of a Patent Office scandal that saw two people jailed and Heany’s patents disallowed. Reference: US Patent 872936, "Tungsten electric incandescent lamp," issued 3 December 1907 to John Allen Heany. See Arthur Bright "The Electric Lamp Industry," for the Heany patent fraud case. There are also contemporary articles in Electrical World.
label: Description (Brief)
content: Brass medium-screw base with skirt, one glass insulator and one ceramic insulator. Seven single-arch non-ductile (sintered) tungsten filaments in series, 7 upper & 6 lower supports (note eyes on upper supports - insulators?), carbon-paste connectors, Siemens seal, asbestos(?) insulator. Tipped S-shaped envelope with taper at neck, 1/2 frost. Mazda A type. “Pat Oct. 15, 1907” stamped on base, “329458”(?) printed on base. “9” inked on one side of press, “H” molded on other side. Label reads: “Heany V Tungsten Pat Dec. 25. 06 Pat Dec. 03. 07 Other Patents Pending”. “Heany” on label in stem. Partial “H” on envelope appears to be remnant of a William Hammer Collection marking.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
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content: Energy & Power
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content: Electric Lamps
creditLine: label: Credit Line
content: from International Business Machines, Inc., William J. Hammer Collection
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320466
label: catalog number
content: 320466
label: accession number
content: 241402
objectType: label: Object Name
content: incandescent lamp
label: Other Terms
content: Lighting Devices; Edison; Cage; Carbon
physicalDescription: label: Measurements
content: overall: 17.2 cm x 6.6 cm; 6 25/32 in x 2 19/32 in