American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 91
f the relay is merely to • relay, or repeat the signals passing over,the main line to the sounder the play of its armature should not be large. Thisplay is regulated by moving forward or backward the contact screw on the front stop(that is the screw next the coils), and the screw on the back stop.… … MORSE MAIN LINE RELAY. lever is pivoted as shown. Care should be observed that the screws do not bind themovement of the lever. The armature and its supports are all insulated from the brasssockets, or spectacles into which the coils of the relay fit, as shown. Pocket Relay—^This relay is designed…
Telegraph
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