[Electric engineering.] . -bered drops and the low-er the return-call room is provided witha double-contact push, suchas that shown in Fig. tongue / makes con-nection normally with theupper contact c, but whenpressure is put on the but-ton k, the tongue is forcedagainst the lower contact return-call pushes onthe lower board of the an-nunciator are of the samedescription. In Fig. 20 allthese pushes are shown diagrammatically, for conveniencein tracing out the circuits. The closure of the circuit in anyroom, as, for example, No. Jf, releases the corresponding dropand rin
[Electric engineering.] . -bered drops and the low-er the return-call room is provided witha double-contact push, suchas that shown in Fig. tongue / makes con-nection normally with theupper contact c, but whenpressure is put on the but-ton k, the tongue is forcedagainst the lower contact return-call pushes onthe lower board of the an-nunciator are of the samedescription. In Fig. 20 allthese pushes are shown diagrammatically, for conveniencein tracing out the circuits. The closure of the circuit 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 broken at d, and,the push button in the roombeing released, a new circuit is formed through k, as follows:from the battery B through g-m-r-n-o-a-c-k-p to the bat-tery, the room bell being in this fig. 20.
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Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
