Plate, Positive. (See [Positive Plate].)
Plating-bath. A vessel of solution for the deposition of metal by electrolysis. Used in electro-plating.
Plating, Electro. The process of depositing metal on surfaces of metals or other substances by the aid of an electrolyte and the electric current.
Platinum Fuse. A slender wire of platinum roused to incandescence by current, and used to explode a charge of powder or other combustible substance.
Plug. A piece of metal, with a handle, used to make electric connections by being inserted between two slightly separated plates or blocks of metal.
A wedge of metal, slightly tapered, and used to thrust between two conductors to close or complete a circuit.
Plumbago. Soft, lustrous graphite; a native form of carbon sometimes chemically purified. It is used chiefly in electrotyping for dusting the wax moulds to make the surface an electric conductor.
Plunge-battery. (See [Battery, Plunge].)
Polar. Pertaining to one of the poles of a magnet.
Polarity. The disposition in a body to place its axis in a particular direction when influenced by magnetism. For example, the attraction and repulsion at the opposite ends of a magnet. The N and S seeking poles of a compass needle is the simplest example.