An international system of electro-therapeutics : for students, general practitioners, and specialists . hile the jar is apart. Hence the charge, whatever its nature, really resides in the dielectric. Again, after an apparently complete discharge of a jar a residualcharge is slowly developed, as mixy be seen by again discharging it,whereupon a small discharge will be obtained. This has been describedas a soaking of the electricity into the dielectric, and a subsequent soaking out. Its real nature will be discussed later. Again, every charge has its corresponding residual charge and dis-charge
An international system of electro-therapeutics : for students, general practitioners, and specialists . hile the jar is apart. Hence the charge, whatever its nature, really resides in the dielectric. Again, after an apparently complete discharge of a jar a residualcharge is slowly developed, as mixy be seen by again discharging it,whereupon a small discharge will be obtained. This has been describedas a soaking of the electricity into the dielectric, and a subsequent soaking out. Its real nature will be discussed later. Again, every charge has its corresponding residual charge and dis-charge ; so that if several charges be given to a jar, the charges beingeither of the same or of different kinds, all the residual charges can beobtained, but in the opposite order to the order of the original is an exact parallel to certain phenomena obtained by twisting anelastic rod. If such a rod be twisted, and then allowed to gently untwist,it will not do so completely, but will retain a residual twist and will shown residual untwisting. Moreover, if the rod be given several such Fig. 8. ELECTRO-PHYSICS. A-19 whether in the same or in opposite directions, corresponding residualtwists and untwistings also take place in the opposite to the order ofthe original twists. Now, these latter are due to elasticity in the rod ; and the similaraction of the Leyden jar, taken together with what was stated as to theseat of the charge, suggests that electrification is an elastic phenomenonof the dielectric, or of something associated with it. Of this, later. Magnetism. 30. We turn now to certain other phenomena long thought quite dis-tinct from the preceding, but which fundamentally are closely allied. Weshall take them up from the point of view of this connection. If acopper wire be bent into a spiral around a glass tube covering a steelrod, such as a knitting-needle, and a charge of electricity—say, from aLeyden jar—be passed through the spiral, the steel rod will
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