National Bureau Of Standards Coiled Tungsten Lamp
date: label: date made
content: ca 1916
notes: label: Description (Brief)
content: General Electric coiled tungsten lamp used at the Bureau of Standards around 1916. Brass mogul-screw base with collar, glass insulator. Type C-7BU tungsten filament with 5 two-piece (crimp connected) supports. Crimp connectors, dumet leads, gas-fill, cork insulator, Two mica heat shields: lower shield attached to leads above press (leads molded to hold shield); upper shield held to top of stem with a metal clip (lead wires supported by passing thru holes in shield). Tipped soft-PS-shaped envelope. "5" inked on one side of press, "5 - a5 14" inked on other side of press, "B.S. 1728" and "National Mazda [GE logo]" etched on envelope.
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: 1992.0342.21
label: accession number
content: 1992.0342
label: catalog number
content: 1992.0342.21
objectType: label: Object Name
content: Light Bulb
label: Object Name
content: incandescent lamp
physicalDescription: label: Physical Description
content: tungsten (overall material)
label: Measurements
content: overall: 10 1/4 in x 5 1/4 in; 26.035 cm x 13.335 cm