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Telegraph Key - Chester, 1855-80 Reg. No: ST 007111
- Telegraph key used for the transmission of signals in the Morse electric telegraph system. Key was manufactured by Chester of New York.
To transmit signals the operator depressed a pivoted metal lever (the key) to complete an electric circuit and transmit current along the telegraph line. Releasing the key broke the circuit and cut off the current. Letters and numbers were represented by a sequence of short and long current pulses, transmitted according to a defined code. The most widely used code was generally known as "Morse code".
At the receiving end the sequence of current pulses could be displayed as long and short marks on a paper tape, or could be interpreted by an operator listening to the sounds made by the receiving instrument.
- Oval brass base frame. Straight pivoted brass key fitted with ebonite knob. Curved pivoted circuit closing lever with ebonite knob attached to base.
- Acquisition Information:
- Donation from Mr John Thompson, 1915
|Dimensions:||45 mm (Height), 85 mm (Width), 141 mm (Length)|
|Tagged with:||morse keys, telegraph equipment, telegraphy|
|Themes this item is part of:||Australia and the global telegraph network 1854-1902, The Australian telegraph network 1854-1877, J.J. Thompson - donor of telegraph objects to the Museum, Telegraphy Collection, Information & Communication Collection|
|Inscriptions:||Side of key and top of circuit closer each engraved:
|Manufacturer:||Chester, New York, New York State, United States of America, 1855-1880|
|Collector:||Mr John Thompson, Armadale, Victoria, Australia, 27 Apr 1915|
This item is part of the following themes: