The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 497
of or giving the restitutive force tothe needle of a galvanometer, core of a solenoid ammeter or movingpart of any similar instrument by a spring. As an example seeAmmeter, Ayrton^s. Spring Jack. An arrangement for effecting, at one insertion ofa species of plug, the opening or breaking of a… … Fig. 307. Spring Jacks. thereby completing the circuit. If a plug or wedge of insulatingmaterial were inserted between the springs so as to press them STANDARD ELECTRICAL DICTIONARY. 493 apart it would break the circuit and the whole would constitute aspring jack cut-out. If each side of the plug…
Electricity
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