Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 205
re. At D, about one inch below the center of H, a small holeis drilled in the brass spring, and a piece of small platinumwire riveted into the hole. The screw, B, which rests againstD, is also tipped with platinum, and it is supported by a verystiff piece of brass. One end of the primary coil is… … connected to the instrument, the hammer, H, should fly rapidlyback and forth, breaking the primary circuit at D. In order to work well, however, a condenser must bebridged across the spark gap, at D. This condenser may bemade by taking about 100 sheets of tin foil 5 inches by 7inches and stacking…
Electric apparatus and appliances · Electricity
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