Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 257
enters by the right-hand postmarked -f. A push-button abovethis post serves to close the circuit.The resistance of the 150 volt coilis about 150,000 ohms, and thereare 150 divisions on the upper, or Fig. 213. —Connections ofblack ink scale, or one di^dsion per Weston Double Scale Volt-volt. The 15… … MEASUREMEXT OF PRESSURE. 239 or even twenty-five thousandths of a volt may easily be readfrom this scale. In using a double scale voltmeter, if indouht about the value of the voltage to be measured, always usethe higher reading scale first, then if the value is below thelimit of the low reading…
Electricity · Magnetism
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