Telegraph keys are electrical on-off switches used to send messages in Morse code. A semi-automatic telegraph key like this one allows an operator to send land-line and wireless telegraph messages at a much faster rate than with an ordinary key. The key automatically produces rapid morse code dots by using a weighted pendulum to quickly make and break contact in the electrical circuit. The operator still makes the dashes manually. This key was hand-made by Western Union operator A. M. Gallant of Massachusetts.
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