rections.

363. Seven of the battery jars were removed, and eight retained for present
use. It was found that about forty turns would fully charge the eight jars.
They were then charged by thirty turns of the machine, and discharged
through the galvanometer, a thick wet string, about ten inches long, being
included in the circuit. The needle was immediately deflected five
divisions and a half, on the one side of the zero, and in vibrating passed
as nearly as possible through five divisions and a half on the other side.

364. The other seven jars were then added to the eight, and the whole
fifteen charged by thirty turns of the machine. The Henley's electrometer
stood not quite half as high as before; but when the discharge was made
through the galvanometer, previously at rest, the needle immediately
vibrated, passing _exactly_ to the same division as in the former instance.
These experiments with eight and with fifteen jars were repeated several
times alternately with the same results.

365. Other experiments were then made, in which all the battery was used,
and its charge (being fifty turns of the machine,) sent through the
galvanometer: but it was modified by being passed sometimes through a mere
wet thread, sometimes through thirty-eight inches of thin string wetted by
distilled water, and sometimes through a string of twelve times the
thickness, only twelve inches in length, and soaked in dilute acid (298.).
With the thick string the charge passed at once; with the thin string it
occupied a sensible time, and with the thread it required two or three
seconds before the electrometer fell entirely down. The current therefore
must have varied extremely in intensity in these different cases, and yet
the deflection of the needle was sensibly the same in all of them. If any
difference occurred, it was that the thin string and thread caused greatest
deflection; and if there is any lateral transmission, as M. Colladon says,
through the silk in the galvanometer coil, it ought to have been so,
because then the intensity is lower and the lateral transmission less.

366. Hence it would appear that _if the same absolute quantity of
electricity pass through the galvanometer, whatever may be its intensity,
the dejecting force upon the magnetic needle is the same._

367. The battery of fifteen jars was then charged by sixty revolutions of
the machine, and discharged, as before, through the galvanometer. The
deflection of the nee