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<p>The apparatus depends for Its operation on the fact that the value of the magnetic flux at any instant is proportional to the algebraic average of the induced e.m.f. during the succeeding half-period. A rotating commutator which reverses the contacts twice per cycle is the essential part, and four brushes, equally spaced, are mounted so that they can be set in any desired position. Two of the brushes are connected to a secondary coil which embraces the flux to be determined, and the other two are connected to a Weston voltmeter or some other instrument whose deflection is proportional to the first power of the current. The apparatus can also be used for plotting curves o
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<br>Subjects: apparatus and instruments; measurements and use of instruments; Electrical instruments and techniques</div>
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