Telegraph Key

Description (Brief):

Telegraph keys are electrical switches used to send coded messages that travel as a series of electrical pulses through a wire. Due to special difficulties in sending pulses through long underwater cables, so-called double-current keys were used. Instead of the short dots and long dashes of land-line telegraphs, submarine telegraphs sent positive pulses and negative pulses that made the receiver move right or left. The operator pressed one lever on the key to send a positive pulse and another to send a negative pulse. The code consisted of the sequence of left and right movements recorded on a paper tape.

Maker: Elliott Brothers

Location: Currently not on view

See more items in: Work and Industry: Electricity, Telegraph Keys, Communications

Exhibition:

Exhibition Location:

Credit Line: from Western Union Corporation

Data Source: National Museum of American History

Id Number: EM.332117Catalog Number: 332117Accession Number: 294351Collector/Donor Number: 100-689

Object Name: telegraph keysubmarine telegraph key

Physical Description: brass (overall material)metal (overall material)plastic (overall material)glass (overall material)Measurements: overall: 3 1/8 in x 5 1/8 in x 6 1/4 in; 7.9375 cm x 13.0175 cm x 15.875 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ac-db09-704b-e053-15f76fa0b4fa

Record Id: nmah_1366667

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