Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 86
he diaphragm, put the wooden mouth- 70 EASY ELECTRICAL EXPERIMENTS. piece on top of this, and screw the whole together by fourscrews at the corners.. The pasteboard ring keeps the woodenmouthpiece from touching the diaphragm except at the edges,leaving the diaphragm free to vibrate. EASY ELECTRICAL… … %^ the other. The ordinary form of electric bell with push buttonis hardly sensitive enough, unless the line be very short, andthe battery used very powerful. We need too, some simple de- 72 EASY ELECTRICAL EXPERIMENTS. vice for cutting the battery out of service when the instru-ment is not in use,…
Electric apparatus and appliances · Electricity
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