Dial telegraph

a telegraph in which letters of the alphabet 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 accurately copies the movements of that at the sending station.

See also: Telegraph

References in periodicals archive ?
Ezra Gilliland, a dial telegraph inventor who co-patented railroad signals with Edison, invented widely, including automatic telephone switching devices, which gained use on small exchanges.