The Standard Electrical Dictionary
The key used in telegraphy for sending currents as desired over the line. It consists of a pivoted lever with finger piece, which lever when depressed makes contact between a contact point on its end and a stationary contact point on the base. This closes the circuit through the line. When released it springs up and opens the line circuit.
The numerical value of key, telegraph in Chaldean Numerology is: 8
The numerical value of key, telegraph in Pythagorean Numerology is: 7
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"key, telegraph." Definitions.net. STANDS4 LLC, 2017. Web. 17 Dec. 2017. <http://www.definitions.net/definition/key, telegraph>.