Johnson Bevel-Ring Keyless Lamp Socket
date: label: date made
content: 1881
notes: label: Description (Brief)
content: Edison "Johnson bevel-ring" keyless lamp socket, 1881. An original specimen as installed in the primary establishment of Hinds, Ketcham & Co., New York, in January, 1881. The wooden stem of the lamp had been replaced by a plaster of Paris stem in which is set two brass rims for connecting with wire. The socket has two contact rings for receiving the lamp, the lower ring is threaded. This form of socket and lamp base proved to be a problem. Tightening the lamp in the socket placed a stress on the base that tended to tear the plaster apart. To correct that problem, Edison moved the contact to the bottom of the lamp so that tightening the lamp compressed the plaster.
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.180934.05
label: catalog number
content: 180934.05
label: accession number
content: 24315
objectType: label: Object Name
content: Lamp Socket
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 2 1/4 in x 2 in; 5.715 cm x 5.08 cm