The American journal of science and arts . oint of strongest deflection, andletting it return freely to its place found the torsion to have been41°. From these experiments, it appears that the deflectingpower, by abruptly passing the poles, is only about two thirds asmuch as when continuous proximity is preserved. In order todetermine whether electricity, produced by inversion of polarity,is in the simple ratio of the number of inversions in a given time,or increases in some higher power, I varied the above experi- Magneto-Electricity, and Electro-magnetical Machines, 129 ments, and instead of
The American journal of science and arts . oint of strongest deflection, andletting it return freely to its place found the torsion to have been41°. From these experiments, it appears that the deflectingpower, by abruptly passing the poles, is only about two thirds asmuch as when continuous proximity is preserved. In order todetermine whether electricity, produced by inversion of polarity,is in the simple ratio of the number of inversions in a given time,or increases in some higher power, I varied the above experi- Magneto-Electricity, and Electro-magnetical Machines, 129 ments, and instead of changing the torsion so as to obtain anequal number of revokitions, I let the torsion remain constant andchanged the number of revolutions to produce equal deflection,and found that to maintain a torsion of 62^*^, required sixty revo-lutions per minute in one case and ninety in the other, whichbeing nearly in the inverse ratio of the deflecting forces, T inier-red that the deflecting forces are as the number of reversals in agiven Explanation of the Figure,n s. The electro-magnetical dipping-needle, fastened to an axis pivoted in thetwo brass columns, E and F. A. Two copper circles or wheels, to which are soldered the two ends of thecoil which wraps n s. B. A block of ivory having two mercury grooves, in which play the two pairsof semicircles of copper, C. D. The support of the ivory. N S. The semicircular magnet, supported by the wooden column, W. Vol. XXXIV.—No. 1. 17 130 Magneto-Electricity^ and Electio-magnetical Machines. The above experiments have a bearing on the construction ofmagneto-electrical machines, and may possibly account for theeffect of those machines, in which the coil is made to revolve atthe side of the magnet* instead of acting opposite to the endsof it. It should be observed, however, that the armature or coil-bound keeper, in the common magneto-electric machine, is soshort, that it scarcely leaves one pole before it begins to be incontact with
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