American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 576
, at which time the presence of theresistance Rh,by temporarily reducing the current strength, pre-vents any effect being felt in the relays ck, te, or th.e magnet am,AUXILIARY FIRE ALARM by uuduc iucrcase of current during such tests, ^^^ An auxiliary fire alarm box is shown in Fig. 348, as it… … 466 AMERICAN TELEGRAPHY,
Telegraph
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