Johnson Bevel-Ring Lamp
date: label: Date made
content: ca 1881
label: associated date
content: 1881
notes: label: Description (Brief)
content: Edison "Johnson bevel-ring" lamp, ca. 1881. Plaster Johnson bevel-ring base with brass screw-shell and contact-ring. Single-arch bamboo filament with copper-plated connectors, three-piece leads. Ball-tipped, pear-shaped envelope.Though smaller than the previous large wooden base, this suffered from stress-failure if over-torqued in the socket (see damage on lamp .03). Placing the contact at the bottom of the base solved the problem. Original specimens as installed in the primary establishment of Hinds, Ketcham & Co., New York, in January, 1881. The wooden stem has been replaced by a plaster of paris stem in which is set two brass rims for connecting with wire.
setName: label: See more items in
content: Work and Industry: Electricity
label: Exhibition
content: Lighting a Revolution
label: Exhibition Location
content: National Museum of American History
creditLine: label: Credit Line
content: from Joseph E. Hinds
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.180934.02
label: catalog number
content: 180934.02
label: accession number
content: 24315
objectType: label: Object Name
content: Light Bulb
label: Object Name
content: incandescent lamp
label: Other Terms
content: Light Bulb; Lighting Devices; Edison; Plaster Screw Base; Horseshoe; Carbon
physicalDescription: label: Physical Description
content: bamboo (overall material)
label: Physical Description
content: plaster (overall material)
label: Measurements
content: overall: 5 1/8 in x 2 in; 13.0175 cm x 5.08 cm