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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 187

An illustration from Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book, 1902, leaf 187 — needle before itmoves at all. Whenthe needle is deflect-ed to 90 degrees,or at right anglesto the wire, it is inthe maximumposition of the cur-rents field. Thevalue of the deflec-tion is dependentupon the currentflowdng through thecoil, but is not pro-portional to the current; that is, if one… … Fig. 154.—Construction of Students DetectorGalvanometer. GALVAXOMETERS. 169 it considerably, but as the angle the needle makes with thecoil increases, a much greater magnetic force is required.For example, it requires a greater force to deflect the needleone degree from the 45-degree position than…

Electricity · Magnetism

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