sactions, 1834, p. 222.
1371. The whole effect produced by a charged conductor on a distant
conductor, insulated or not, is by my theory assumed to be due to an action
propagated from particle to particle of the intervening and insulating
dielectric, all the particles being considered as thrown for the time into
a forced condition, from which they endeavour to return to their normal or
natural state. The theory, therefore, seems to supply an easy explanation
of the influence of _distance_ in affecting induction (1303. 1364.). As the
distance is diminished induction increases; for there are then fewer
particles in the line of inductive force to oppose their united resistance
to the assumption of the forced or polarized state, and _vice versa._
Again, as the distance diminishes, discharge across happens with a lower
charge of electricity; for if, as in Harris's experiments (1364), the
interval be diminished to one-half, then half the electricity required to
discharge across the first interval is sufficient to strike across the
second; and it is evident, also, that at that time there are only half the
number of interposed molecules uniting their forces to resist the
discharge.
1372. The effect of enlarging the conducting surfaces which are opposed to
each other in the act of induction, is, if the electricity be limited in
its supply, to lower the intensity of action; and this follows as a very
natural consequence from the increased area of the dielectric across which
the induction is effected. For by diffusing the inductive action, which at
first was exerted through one square inch of sectional area of the
dielectric, over two or three square inches of such area, twice or three
times the number of molecules of the dielectric are brought into the
polarized condition, and employed in sustaining the inductive action, and
consequently the tension belonging to the smaller number on which the
limited force was originally accumulated, must fall in a proportionate
degree.
1373. For the same reason diminishing these opposing surfaces must increase
the intensity, and the effect will increase until the surfaces become
points. But in this case, the tension of the particles of the dielectric
next the points is higher than that of particles midway, because of the
lateral action and consequent bulging, as it were, of the lines of
inductive force at the middle distance (1369.).
1374. The more exalted effects of induction on a point
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