Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 136
eading to the instrument EASY ELECTRICAL EXPERIMENTS. i2r Now adjust the counterweight by making it heavier or lighter,as the case may require, until the pointer stands exactly at themiddle of the scale. Make a line here and mark it 5 volts. Dis-connect one cell, leaving only four in series, and… … COPPER Simple Voltmeter. thus until five points are marked upon the scale correspondingto 1, 2, 3, 4 and 5 volts. It will be found that the spaces betweenthe various points are not quite equal, that at the center beingthe longest. On the other side of the middle point the spacesshould be marked…
Electric apparatus and appliances · Electricity
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