Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 327
e diagram (Fig. 201), A is an electro-magnet throughthe coils of which the original current passes to earth. Thesoft iron armature is carried by a brass arm which is lightlysuspended on a pivot (J3), and has its motion controlled bythe two screws, &, b, of which b is insulated by having its 3o8… … tact with a, thus completing the circuit in the local battery,in which circuit the indicator is included. Each time thatthe current from the line passes through the relay, the local chap, v.] Electro- Magnetism and Dynamics. 309 battery transmits a current through the electro-magnet of…
Electricity
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