American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 90
ure by means of the adjusting screw, a, which is attached to thecores suitably for that purpose, or by the aid of the retractile spring e, attached to theannature. In wet weather, when, owing to escapes due to defective insulation,the cm-rent strength is much increased at the battery end, or ends,… … MORSE MAIN LINE RELAY. prompt action. Thousands of retractile springs are wasted annually by turning themaround the cross-bar of the winding screw s.) The explanation of the increasedstrength of current, at such times, is that the circuit is virtually shortened, and, con-sequently, the resistance…
Telegraph
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