The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 108
ent has been inducedin the coil. This current is only transient, continuingonly during the downward movement of the magnet;but when the magnet is withdrawn the needle is de-flected in the opposite direction, showing the inductionof a reverse current which continues only during theupward movement.… … Fig. 39. iron core within the coil, and the alternate approachand withdrawal of each pole of the magnet from itsprojecting end. Current Induced by Another Current.—For the current-bearing conductor a small coil connected with a batterymay be used as shown in Fig. 40. This is known as theprimary…
Electricity · Magnetism
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