Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 216
inch high and are made of thin brass. The shank ofthe spool is likewise made of thin brass and has an openingthrough its center % inch long and 3-16 inch wide. The pur- EASY ELECTRICAL EXPERIMENTS. 20I pose of this opening is to allow the coils to be supported closeto the moving armature and yet to… … JJ jecting by means of which the spool may be screwed to thebaseboard. Carefully insulate the whole interior surface of the spooland wind the same full of No. 36 double silk covered magnetwire. The spools are then mounted in the position shown inFig. 3. They are connected together in such a way…
Electric apparatus and appliances · Electricity
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