National Bureau Of Standards Carbon Lamp
date: label: date made
content: ca 1920
notes: label: Description (Brief)
content: General Electric carbon lamp used at the Bureau of Standards around 1920. Brass medium-screw base with glass insulator. Two single-arch carbon filaments mounted concentrically and wired parallel. With carbon-paste connectors, 2-piece leads, fiber insulator. Tipped S-shaped envelope with taper at neck. "116- 560L" inked in base. "BS722" etched on envelope. "a1223" inked on press, "T" etched on one side of envelope (perpendicular to plane of filaments), "|" etched on opposite side. Patent label in stem with red GE watermark: "The manufacturer of this lamp is licensed under patents noted on other side." "Re-issue Oct-10-05 12,393 Mar-20-94 516,800 APR-16-95 537,493 APR-16-95 537,693 APR-28-03 726,293 AND OTHERS [H.P.5036]". "#2" written on plastic tape on lamp, "B.S.722 8/22/16 #2" inked on envelope (later). Inked on bottom of box, "B.S.722 C.P. 19.0 [check mark] Volts 119.0 [check mark] Amp. .573 [check mark] .5808 (penciled) To be used only for checking other stationary standards.", (Penciled) N.G. [arrow] Subjected to (8/22/16) 150V. accidentally."
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from the U. S. Department of Commerce, National Institute of Standards & Technology
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1992.0342.07
label: catalog number
content: 1992.0342.07
label: accession number
content: 1992.0342
objectType: label: Object Name
content: Light Bulb
label: Object Name
content: incandescent lamp
physicalDescription: label: Physical Description
content: carbon (overall material)
label: Measurements
content: overall: 5 in x 2 3/8 in; 12.7 cm x 6.0325 cm