Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 188
at a distance of about 1% inches from the nearer end of L.This is accomplished by boring a small hole through the pieceand passing a screw through this hole into a block supported EASY ELECTRICAL EXPERIMENTS. 173 upon the wooden base. The lever should be so located uponthe base that its end rests… … The Automatic Circuit Closer is supported by a strip of brass bent over at right angles andfastened to the base board. Five binding posts are provided in the position shown andthe connections for the various parts of the apparatus areshown by lines. The bell to be rung is attached at the top,the…
Electric apparatus and appliances · Electricity
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