send-receive cable telegraph sweep switch
date: label: date made
content: ca 1900
name: label: maker
content: Muirhead & Co. Ltd.
notes: label: Description (Brief)
content: Submarine telegraph switch marked: "Muirhead & Co. Ltd / No. 38986". This switch was used on a submarine cable when the cable was worked simplex to allow switching between transmit and receive condition on the cable. As it switched between transmit and receive, it would ground the cable momentarily, thereby freeing the cable of any charge which could damage the receiving system. Hard rubber base and handle with four terminals and switch arm made of brass. Terminals marked: R, E, L and K. The switch is part of a submarine telegraph testing system, mounted on a black-painted base with another switch and a double key.
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 French Cable Company
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.336834
label: catalog number
content: 336834
label: accession number
content: 1978.2346
objectType: label: Object Name
content: Switch, Send-Receive
label: Object Name
content: telegraph switch
label: Object Name
content: switch
label: Other Terms
content: Switch, Send-Receive; Telegraphy
physicalDescription: label: Physical Description
content: wood (base material)
label: Measurements
content: overall: 4 in x 11 in x 9 in; 10.16 cm x 27.94 cm x 22.86 cm
label: Measurements
content: switch: 2 3/4 in x 4 1/2 in x 6 1/2 in; 6.985 cm x 11.43 cm x 16.51 cm