Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 225
he pointer so thatit is directly over its reflection in themirror, errors in reading the scaledivisions due to parallax * are thusavoided. In Weston instruments thepost marked -f is the one by whichthe current should enter the instru-ment so that the coil will be deflectedin the right… … Fig. 197.—The Magnetic Cir cuit of the Weston Instruments. alloy, and contained either in the in-strument, in a separate portable case,or on an external block, Fig. 199, as inthe switchboard type of instruments.The lead wires to the shunt, the instru-ment and the shunt, are all numberedto…
Electricity · Magnetism
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