Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 134
pHshed electromag-netically in a variety of ways in the various ticker systems.For fast working an additional wire is generally used forthe current which actuates the shifting magnet, thus neces-sitating two line wires to each ticker. Should, for any reason, the type-wheel of a ticker bethrown out… … Fig. 7. result. Automatic devices, termed unison devices, are availedof to bring the tickers back into step whenever desired.
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
