. The London, Edinburgh and Dublin philosophical magazine and journal of science . 0. Maximum deflexion. Minimum deflexion. 368 363 365 362 366 359 367 357367 359 Index-wheel went five times round in 49 seconds. 364 359 363 360 364 361Index-wheel went five times round in 49£ seconds. 366 357 365 3550=+2°. The index-wheel going round once corresponds to ninety-seven revolutions of the magnet. Allowing 2° for the effective set, we have a deflexion of360o,25 caused by a velocity of 9*825 revolutions a Table I. in the first five lines the rate-observations weresimultaneous with the angle
. The London, Edinburgh and Dublin philosophical magazine and journal of science . 0. Maximum deflexion. Minimum deflexion. 368 363 365 362 366 359 367 357367 359 Index-wheel went five times round in 49 seconds. 364 359 363 360 364 361Index-wheel went five times round in 49£ seconds. 366 357 365 3550=+2°. The index-wheel going round once corresponds to ninety-seven revolutions of the magnet. Allowing 2° for the effective set, we have a deflexion of360o,25 caused by a velocity of 9*825 revolutions a Table I. in the first five lines the rate-observations weresimultaneous with the angle-observations ; in the latter sixthey were taken as in the example given : each result is themean of about eight observations. Table I. Angular-velocity, rotationsper second. Angular torsion, 0-258 o 9-7 0-527 19-3 1-672 60-5 1-702 61-3 2-517 91-2 2-900 106-9 5-374 193-9 7-886 285-9 8-186 303-9 9-877 360-3 23-307 840-0 Magneto-Electric Induction. 453 It appears from these numbers and from their graphicrepresentation in line 1, fig. A, that the torsion varies directly Fig. as the rate. So exactly is this the case that we may in futurewith perfect confidence reduce from one rate to another or toany arbitrary common rate when the rate varies between ex-periments, to test the effect of variation of other kinds. Andwe have, if the magnets and torsion keep constant, a veryexact and not inconvenient instrument for measuring the rateof rotation of machinery. II. The Relation between Distance and Deflexion.—Two seriesof experiments were made to determine this need only reproduce here the longest and most apparatus used was that shown in tig. 1, Plate XIII., whichis drawn to a scale one third true size. The copper disk, c, was replaced by one of ebonite, to thelower surface of which the metal plate could be attached bya drop of weak gum. The copper disk used was only 027millim. thick ; so that all its parts might be considered at thesame distance fro
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