Abstract
1318. I proceed now, according to my promise, to examine, by the great facts of electrical science, that theory of induction which I have ventured to put forth (1165. 1295. &c.). The principle of induction is so universal that it pervades all electrical phenomena; but the general case which I purpose at present to go into consists of insulation traced into and terminating with discharge, with the accompanying effects. This case includes the various
modes
of discharge, and also the condition and characters of a current; the elements of magnetic action being amongst the latter. I shall necessarily have occasion to speak theoretically, and even hypothetically; and though these papers profess to be experimental researches, I hope that, considering the facts and investigations contained in the last series in support of the particular view advanced, I shall not be considered as taking too much liberty on the present occasion, or as departing too far from the character which they ought to have, especially as I shall use every opportunity which presents itself of returning to that strong test of truth, experiment. 1319. Induction has as yet been considered in these papers only in cases of insulation;—opposed to insulation is
discharge
. The action or effect which may be expressed by the general term
discharge
, may take place, as far as we are aware at present, in several modes. Thus, that which is called simply
conduction
involves no chemical action, and apparently no displacement of the particles concerned. A second mode may be called
electrolytic discharge
; in it chemical action does occur, and particles must, to a certain degree, be displaced. A third mode, namely, that by sparks or brushes, may, because of its violent displacement of the particles of the
dielectric
in its course, be called the
disruptive discharge
; and a fourth may, perhaps, be conveniently distinguished for a time by the words
convection
, or
carrying discharge
, being that in which discharge is effected either by the carrying power of solid partides, or those of gases and liquids. Hereafter, perhaps, all these modes may appear as the result of one common principle, but at present they require to be considered apart; and I will now speak of the
first
mode, for amongst all the forms of discharge that which we express by the term conduction appears the most simple and the most directly in contrast with insulation.
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12 articles.
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