Definition of dial telegraph
: a telegraph in which letters and numbers or other symbols are placed upon the border of a circular dial plate at each station, the apparatus being so arranged that the needle or index of the dial at the receiving station copies the movements of that at the transmitting station
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“Dial telegraph.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dial%20telegraph. Accessed 19 Sep. 2021.
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The first known use of dial telegraph was in 1845
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