Owing to gyrostatic action a rotating armature resists any change of direction of its axis. On ships and in railway motors which have to turn curves this action occurs. A 148 lb. armature running at 1,300 revolutions per minute may press with 30 lbs. on each journal as the ship rolls through an angle of [...]

The hardened milky juice of a tree, the Isonandra gutta, growing in Malacca and other parts of the Eastern Archipelago. It is much used as an insulator or constituent of insulators. Resistance after several minutes electrification per 1 centimeter cube at 54º C. (75º F.),  4.50E14 ohms. The specific resistance varies–from 2.5E13 to 5.0E14 ohms. [...]

An electro-magnet with tubular core. If, when it is excited a piece of an iron rod is pushed into the central aperture of the core and is released, the magnetic circle will try to complete itself by pushing the rod out so that it can thus be discharged, as if from a popgun. Synonym–Electric Popgun.

A metal tube surrounding a dry pile used with a quadrant electrometer, or other electrometers of that type. It prevents the capacity of the lower brass end of the pile (which brass end closes the glass tube containing the discs) from momentary change by approach of some conductor connected to the earth. There are other [...]

An annular horizontal surface surrounding the balanced disc in the absolute electrometer. (See Electrometer, Absolute.)

A voltaic battery depending for its action on the oxidation of hydrogen instead of the oxidation of zinc. Its action is more particularly described under Battery, Gas. In the cut B, B1 * * * are the terminals of the positive or hydrogen electrodes, marked H, and A, Al * * * are the terminals [...]

A metaphorical term applied to the earth when used as a return circuit.

The contact of a conductor of an electric circuit with the earth, permitting the escape of current if another ground exists.

A lead plate perforated or ridged for use in a storage battery as the supporter of the active materials and in part as contributing thereto from its own substance.

Control by weight. In some ammeters and voltmeters gravity is the controlling force.