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<p>Describes an investigation of the once exerted by various galvanometer coils as compared with a set of three coils used as standards. Some of the coils were wound according to theoretical requirements, while others were wound empirically. The behaviour of any coil under test was determined by observing the deflection produced by a given current as compared with the deflection produced by the same current when passed through the standard coils. Numerical data are given relating to the force exerted by coils having various resistances. A simple 6-ohm coil is described, wound with a single size of wire (No. 28), which was found to be very ef
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<br>Subjects: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties</div>
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