In [Fig. 5], improved “dischargers,” and a convenient metallic connecting rod are shown.
The ball terminations of the dischargers should vary in size, for within certain limits, the larger the ball the more intense the spark; with the pointed end the spark is very small; with the discharger terminating in many small metallic points still smaller, and with a similar discharger made of wood, a luminous glow alone results, and no spark.[6]
I shall discuss, in my third Lecture, the therapeutic values of Franklinism.
VOLTAISM OR GALVANISM.
Voltaism.
The Voltaic current is a continuous current. Unless artificially interrupted, the electricity flows in an unbroken stream until the battery is exhausted. The current will gradually lessen in power until it ceases, but there will be no break in it, and no change in its direction, which is uniformly from the positive to the negative pole. |Points of distinction between the Voltaic and Faradaic Currents.| It is important to recollect these points, for they constitute the chief physical distinction between the Voltaic and the Faradaic—or, as it is sometimes called, the Induced current. This latter is not, strictly speaking, a “current,” but a rapid discharge or succession of momentary shocks, each perfectly distinct in itself, and separated by an appreciable interval of time from its fellows.
Voltaic Cells.
In electrization, a source of electricity is of course necessary, and this is furnished by a cell or cells, with contained elements and chemicals; and, until a few years ago, it was impossible to get a portable cell that remained always in order and ready for use.[7]
Requisites of a Portable Battery.