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<p>The importance of the e.m.f. developed by the relative motion of the magnet and the winding of the galvanometer is pointed out and the general theory of the instrument is developed. The fundamental equation is stated and a solution is obtained giving the various working constants in terms of the intrinsic constants. The advantage of using a transformer with an instrument developing a relatively large back e.m.f. is shown. The double period sometimes observed is due to the system being unsymmetrical. A method of tuning more sensitive than the method generally employed is described. It consists in adjusting the frequency of the driving force or the moving system so tha
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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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