Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 159
i^C … ings, allowance should be made for loss of metal in finish-ing, which will amount to at least 1-16 inch. The brush holder shown in Fig. 2 is very simple, and fairly EASY ELECTRICAL EXPERIMENTS. 145 efficient. Each brush holder consists of a brass spring S,a brass ferrule A, and a carbon rod C. The…
Electric apparatus and appliances · Electricity
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