Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 47
Frs 2. hole through each at the top, the hole being in the center and ata distance of J4 inch from the end of the bar. Having procureda block of iron such as is shown at B, and of the size, just given, EASY ELECTRICAL EXPERIMENTS. 39 have two 2^-inch holes bored through it from one of the…
Electric apparatus and appliances · Electricity
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