International Library of Technology · Scranton, International Textbook Co. · leaf 704
in anyroom, as, for example, No. Jf, releases the corresponding dropand rings the office bell /. The path of the current is thenfrom the push Jf. throughc-d-c-f-g-B-h-o, and backto the lower contact of thepush button. On the returnsignal being made from theoffice, the annunciator-bellcircuit is… … fig. 20.
Electrical engineering
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