Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 366
ing-screws, are connected with the battery. The two up-rights in which the spindle works are insulated from eachother, but connected with the contact breaker. The Contact Breaker.—This in large coils is an indepen-dent engine, but in small coils is worked by the electro-magnet of the primary coil.… … Fig. 227. metal stud, which makes contact by pressing against theadjustable screw D. The passing of the current makes theelectro-magnet, which attracts B, and breaks the circuit indoing so. B continues rapidly vibrating backwards andforwards. The opposed surfaces must be of platinum, as anyother…
Electricity
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