Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 264
CURRENTS. 247 which, in this connection, is called the primary cur-rent The phenomena belong to the same class asthose presented by the secondaries induced in anotherconductor placed in the vicinity of the one which isconveying the battery current. 393. These secondary currents may be separatedfrom… … belonging to the upper spiral, rub their ends to-gether while the circuit through the lower one israpidly broken. Sparks will be seen, and slightshocks may be felt through the fingers, or by placingthe wires in the mouth. When the ends of thewires are joined, the sparks and snaps given by thespiral…
