Silenced Instrument Key

Description (Brief)
Telegraph keys are electrical on-off switches used to send messages in Morse code. This Silenced Instrument Key was made for US Army by L. S. Brach Company in 1918 and is designed to make no noise when the operator is sending. The front contact features a needle on the bottom of the lever that dips into a mercury cup to quietly complete the circuit. The rear contact has a rubber boot to silence the return action. A small light bulb assembly permits the operator to visually monitor the signal.
Location
Currently not on view
date made
1918
maker
L. S. Brach Manufacturing Co.
Physical Description
wood (overall material)
metal (overall material)
plastic (overall material)
rubber (overall material)
Measurements
overall: 3 3/4 in x 3 1/2 in x 13 1/2 in; 9.525 cm x 8.89 cm x 34.29 cm
ID Number
EM.321456
accession number
241556
catalog number
321456
Credit Line
from Franklin Wingard
See more items in
Work and Industry: Electricity
Communications
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center

Comments

Add a comment about this object