Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 188
the station. 6. Suppose a call comes from station 1— The drop falls, displaying number 1 to the operator. She then inserts either plug, as P, of any pair, say the fourth, in the jack,closes the listening key, K, and learns that connection is desired with 40; forexample, the circuit being main line,… … 178. Three Jacks, Three Drops, One Clearing=out Drop. On pressing K she hears station 40s response and then 40 and 1 talking.Releasing K, she may give attention to other calls and connections. The clearing-out drop C O. of high resistance and impedance, being perma-nently bridged across the talking…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-475-248.webp)
