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. "-1151- 560L" inked in base. "BS729" 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.729 9/20/24 11/6/25" inked on envelope (later). Label on box reads: "Standard Lamp", inked on bottom, "B.S.729 CP. 18.58 9/20/24 11/6/25 Volts 117.0 Amp. .575". Wrapper sleeve reads: "The lamp contained herein is [a product of] the Edison Lamp Works of General Electric Company which [markets?] Mazda and GEM lamps exclusively through its own [Dealers?] and Agents direct to the Consumer except [when] such lamps are sold to Central Lighting Stations. The lamp contained herein is of one of the classes named below. Among the patents of the General Electric Company relating to the particular class to which the contained lamp belongs are those indicated in the [?] Class Date Gem lamp Nov. 8, 1904 Mar. [16?], 190[9?] Mazda Lamp Apr. 28, 190[3?] July 11, 1911 Feb. [27?], 1918 Oct. [28?], 191[8?] July [26?], 191[8?] Oct. 13, 1918 The trademarks appearing hereon and on the lamp contained herein are the property of the General Electric Company. C6930".
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: 1992.0342.06
label: catalog number
content: 1992.0342.06
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