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. One knob is missing from this specimen.
Location
Currently not on view
Object Name
telegraph key
submarine telegraph key
date made
ca 1890
maker
Western Electric
Physical Description
brass (overall material)
metal (overall material)
plastic (overall material)
Measurements
overall: 2 1/4 in x 2 3/4 in x 5 3/8 in; 5.715 cm x 6.985 cm x 13.6525 cm
ID Number
EM*332224
accession number
294351
collector/donor number
100-391
catalog number
332224
subject
Communications
Telegraph Keys
See more items in
Work and Industry: Electricity
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
from Western Union Corporation

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