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 220
h refinement of precision is not required. In somemakes of both types the whole .current passes through the am-meter, while in others the ammeter is shunted, % 209. • Theshunt may either be contained within the instrument case, orit may be external to the instrument. In the latter casespecial leads… … 204. Gravity Ammeter.—In this simple type of amme-ter, the magnetising current overcomes the attraction ofgravity for a piece of suspended iron. The current passesaround a helix of heavy wire, which is bent in the arc of acircle, Fig. 188. A soft iron core bent to the same arc is sus-pended, so…
Electricity · Magnetism
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