The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 331
rester, ground switch, and cut-out are also required. The Battery.—The principal requirements of the bat-tery are strength and constancy, and any good batteryfulfilling these conditions can be employed. The gravitybattery is one of the best and cheapest, and hence isextensively used for this… … Fig. ioo.have a vertical movement, limited by two set-screwswhich can be adjusted to any required range of motion;the upward movement being produced by a spring con-nected with one of the screws, and the downward bypressure on the hard-rubber knob at the left, which THE ELECTRIC TELEGRAPH. 315…
Electricity · Magnetism
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