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Updated: May 17, 2025
The iron will now be removed, but the spirals left in the same position as before, and by increasing the speed of the reversals you see a higher deflection is given on the galvanometer. Now, on again interposing the iron plate the deflection falls to a little less than one-half, as before. I wish this fact to be carefully noted.
I mean, of course, by the term alternating currents, currents of electricity reversed at frequent intervals, so that a positive flow is succeeded by a negative flow, and that again by a positive flow, such reversals occurring many times in a second, so that the curve of current of electromotive force will, if plotted, be a wave line, the amplitude of which is the arithmetical sum of the positive and negative maxima of current or electromotive force, as the case may be, while a horizontal middle line joins the zero points of current or electromotive force.
Before proceeding, please to bear in mind the fact that the inductive effects vary inversely as the square of the distance between the two spirals, when parallel to each other; and that the induced current in B is proportional to the number of reversals of the battery current passing through spiral A, and also to the strength of the current so passing.
Their primitive docility, their politeness, their marriage customs, their universal adoption of Chinese thoughts, language, and literature, and now, in recent times, their rejection of the Chinese philosophy and science, their assertiveness in Korea and China and their aggressive attitude toward the whole world all these multitudinous changes and complete reversals of ideals and customs, point to the fact that the former characteristics of their civilization were not "impersonal," but communal, and that they rested on social development rather than on inherent nature or on deficient mental differentiation.
When an alternating current flows through a coil of wire the reversals of the current set up a counter electromotive force in it which opposes, that is reacts, on the current, and the higher the frequency of the current the greater will be the reactance.
Violent and sudden reversals of policy are never effected by a party without a great loss of moral weight; though there are circumstances under which they have been imperatively required. In each of these cases a ministry pledged to resist a particular measure introduced and carried it, and did so without any appeal to the electors.
In this sense Islam was something like a Christian heresy. The early heresies had been full of mad reversals and evasions of the Incarnation, rescuing their Jesus from the reality of his body even at the expense of the sincerity of his soul.
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