Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 120
he end of one coil to the inside of the bottom EASY ELECTRICAL EXPERIMENTS, 105 of the wooden framework, at a distance of 4 inches from thecenter, by means of a double pointed tack driven tightly intothe wood. This tack should grip the wire close to the coil, sothat the loose end of the wire may… … Fig. 3. screw of one section. The coil should be drawn tightly againstthe upper board, as this draws the spirals of the coil apart andprevents their touching each other. At a distance of ¥% inch from the first hole just bored, boreanother, and through this pass the upper end of another coilof wire,…
Electric apparatus and appliances · Electricity
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