American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 387
the top of thetransmitter rod r restsagainst two contact pointsF, p, being held there by aretractile spring rs. Thesecontact points are respec-Cively connected, electrical-ly, to one of the main cir-cuits. There is anothercontact point ep, adjacentto R and against which itmay be placed, ep is… … 2^ /I JS 240 o/,ms with the circuit of magnet m, as indicated by the dotted line. Noi-mally that wire isopen at ep. In the central office CO, n, n are annunciators, w w are wedges capable of beinginserted in the receptacles, or spring-jacks j j. The metallic tube w of the wedge isinsulated from the…
Telegraph
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