American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 298
branch office. The pole-changer pc^ of the Cincinnati set is not opened,however, as, at the moment the repeating transmitter rt starts to open, a local cir-cuit via the lever of rt^, including the local battery lb^, comes into play, and thus,automatically, keeps the magnet of pc^ closed. The local… … 250 AMERICAN TELEGRAPHY. botli the Chicago and the St. Louis sets have, through their polar relays, similar con-trol of their respective repeating transmitters, and that each pole-changer is, at theproper time, kept closed, automatically, by its local battery, acting through the leverof its…
Telegraph
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-129-43.webp)
