Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 186
r and a receiver.The appearance of the instrument made by the GrayNational Telautograph Company is shown in Fig. 6. These MISCELLANEOUS TELEGRAPHS 171 devices may be operated singly over a private line or con-nected through a switchboard so as to enable any twoinstruments to be used together. Also,… … Fig. 6. surfaces of two curved rheostats, which are connected acrossdirect-current supply mains, usually of 115 volts. Thepotential difference between either end of each rheostatand the accompan}dng roller varies with the position ofthis roller, which position changes in writing. These vary-ing…
Telegraph
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