G
Galvanic. Voltaic. Relating to current electricity or the electro-chemical relations of metals.
Galvanic Taste. A salty taste in the mouth resulting from the passage of a light current from a voltaic battery, the ends of the wires being held to either side of the tongue. This has been called tasting electricity, but it is really the decomposition of saliva on the surface of the tongue, due to electrolysis or the passage of a current through a liquid.
Galvanism. The science of voltaic, or current, electricity.
Galvanizing. Coating iron with a thin layer of zinc by immersing the object in the molten metal.
Galvano-faradic. In medical electricity the shocking-coil. The application of the voltaic current, induced by a secondary current (induction-coil), to any part of the body.
Galvanometer. An instrument for measuring current strength.
A magnetic needle influenced by the passage of a current through a wire or coil located near it.
Galvanometer, Tangent. A galvanometer provided with two magnetic needles differing in length, the shorter one serving to measure tangents, the longer being used for sine measurements of current strength.
Galvanoscope. An instrument, generally of the galvanometer type, used to ascertain whether a current is flowing or not.
Generator. An apparatus for maintaining an electric current, such as a dynamo, a faradic machine, a battery, etc.
German-silver. An alloy of copper, nickel, and zinc. Used chiefly in resistance-coils, either in the form of wire or in strips of the sheet-metal.
Gold-bath. A solution of gold used for depositing that metal in the electro-plating bath.
Graphite. A form of carbon. It occurs in nature as a mineral, and also is made artificially by the agency of electric heat.
Gravity Battery. (See [Battery, Gravity].)
Grounded Circuit. (See [Circuit, Grounded].)
Ground-plate. (See [Plate, Ground].)
Ground-wire. The contact of a conductor, in an electric circuit, with the earth. It permits the escape of current if another ground-wire exists.
Guard Tube. A tube inserted in a wooden or brick partition to insulate wires that may pass through it. These tubes are made of porcelain, gutta-percha, compositions of a non-conducting nature, and fibre.
Gutta-percha. Caoutchouc treated with sulphur to harden it; sometimes called vulcanized rubber or vulcanite. It is a product obtained from tropical trees, and when properly treated it is a valuable insulator in electrical work, particularly in submarine cables, since it offers great resistance to the destructive agencies of the ocean’s depths.