Thirdly, of Faradism, the induced currents of momentary duration, which are generated or induced, in a coil of wire by the action upon it, under certain circumstances, of a magnet, or of a Voltaic current.
FRANKLINISM.
Franklinism, sometimes of the utmost value, and far surpassing, in certain cases, any other form of electricity, has some inconveniences in its application, and has hitherto been little used but by specialists. Recent improvements in Franklinic instruments have, however, largely removed these inconveniences, and have placed at the general service of the profession a remedy of much good and still greater promise. The fundamental requisite in all Franklinic machines, consists in the rotation of a glass plate against a leathern or other rubber, and the accumulation of the resulting electricity upon a metallic receiver, insulated by a non-conducting support, usually of glass.
Franklinism
Discarding the primitive cylinder machine, now long since disused, we will firstly consider the plate machine in which the electricity arising from the friction of the rotating glass plate against the upper and lower cushions, is collected by two brass arms and distributed to the brass conductor, from which they branch out, and which is insulated by a glass support.
Fig. 1. Plate Electrical Machine and Glass-legged Stool.
The machine should be fixed upon a firm stand that it may be quite steady during rotation, and be screwed to a heavy painted deal table, as is shown in [Fig. 1].
Fig. 2. Winter’s Machine.