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 281
he ratioof volts -s- amperes, Formula (30). The principle of action isas follows : Two coils, A, A, Fig. 236, are connected in seriesand to the source of current used in making the measure-ment, generally several cellsfor low resistance and a mag-neto, 51 322, for high resist-ance. Between these… … Fig. 236.—Construction and Connectionsof a Direct Reading Ohmmeter. This connection ismade by joining the unknown resistance to the binding posts1- 2 Current is led to the movable coil by the springs, S, asin the case of the Weston movable coil, Fig. 198. MEASUREMENT OF RESISTANCE. 263 When the…
Electricity · Magnetism
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