The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 335
by two screws by which its range of mo-tion can be adjusted. A retractile spring holds it 3l8 DYNAMIC ELECTRICITY AND MAGNETISM. against the poiiit of the left hand screw when the cir-cuit is open, while a weaker spring below tends to forceit in the opposite direction; the tension of the… … Fig. 103. its circuit the sounder or register; and the electromag-net is connected with the line by the two binding-postson the right. Hence, when the line current passesthrough the magnet coils, the armature is attracted andthe local circuit closed by contact between the platinumpoints attached to…
Electricity · Magnetism
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