Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 176
strips R. This lever is 3% incheslong and the pivot is iy2 inches from the left-hand end of EASY ELECTRICAL EXPERIMENTS. 161 the lever. It may be made from a piece of sheet brass 1-16inch thick and % inch wide. In order to •support the carbons there will be needed twosmall brass sockets shown at C.… … The Are Lamp «hown, and secured to the post at the bottom, so that theouter end of the spring projects 2 inches from the post. Near the outer end of the lever L and the spring S solderone of the little brass sockets just described. They shouldbe equal distances from the post P when the lever L…
Electric apparatus and appliances · Electricity
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