Electrical measurementsA laboratory manual . method takes into account the relativeintensities of magnetization in both cases. Calling theseB^ and D^ and using the same notation as above, 2(A+i>0 For fuller explanations the student is referred toKohlrausch and Maxwell as cited above. 137. Magnetic Inclination by Webers Earth-Inductor. — When a conductor is moved in a magneticfield so as to cut lines of force, the time integral of theelectromotive force generated is equal, in measure,to the number of lines cut. If the conductor is a planecoil of wire of total area S which makes angles
Electrical measurementsA laboratory manual . method takes into account the relativeintensities of magnetization in both cases. Calling theseB^ and D^ and using the same notation as above, 2(A+i>0 For fuller explanations the student is referred toKohlrausch and Maxwell as cited above. 137. Magnetic Inclination by Webers Earth-Inductor. — When a conductor is moved in a magneticfield so as to cut lines of force, the time integral of theelectromotive force generated is equal, in measure,to the number of lines cut. If the conductor is a planecoil of wire of total area S which makes angles ! — sin </)2). It is necessary toA Q count (/) from 0° —J „ to 360°. In Webersearth- inductor(Fig. 129) thecoil of wire Gr isusually moimtedon an axis A inits plane. Thisaxis is supportedby a frame Fmounted on twoijL {jt trunnions T, F,g. 129. whose axis makes TC. Z JT w MAGXETISM. 285 a right angle \\-ith the fost axis. The trunnions are car-ried on supports fastened to a platform resting on threelevelling screws L. For the purposes of this experi-ment the axis T should be level and in a magneticeast and west line. On the frame are stops Avhich, asgenerally used, limit the angle through which the coilmay be turned to 180°. Some earth-inductors areturned by hand and others are turned by means ofsprings on the removal of a detent. The earth-inductor should be joined in series with aballistic galvanometer of long period of oscillation, and,if need be, Avith a coil of suitable resistance. On turningthe coil through 180° an inductive impulse will be felt inthe galvanometer. The sine of one-half the throw of thegalvanometer needle will be proportional to the quantityof electricit} passing through the circuit. Three methodsmay be used in producing the deflection. In the first asingle reversal of the coil gives a single impulse to theneedle. In the
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherbosto, bookyear1895
