A dictionary of electrical words by Houston Edwin James 1847-1914

Author:Houston, Edwin James, 1847-1914. [from old catalog]
Language: eng
Format: epub
Tags: Electricity, Electrical engineering
Publisher: New York, The W. J. Johnston co., ld.
Published: 1889-03-25T05:00:00+00:00

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WORDS, tCRMS AND PHRASES. S^l

or line of shafting, the working of a machine, or other similar events or occurrences.

Indicators are of various forms. They are generally electromagnetic in character.

Indlealors, Electric Circuit Various devices,

generally in the form of vertical galvanometers, employed to indicate the presence and direction of a current in a circuit, and often to roughly measure its strength. (See Oalvanometer, Vertical.)

Induced Current, Direct Induced Current.— <See

Current, Extra,)

Induced Current, RcTcrse Induced Current*—

(See Current, Extra,)

Induction Balance, Hughes' -—(See Balance,

Induction, Hughes\)

Induction, Dynamo Electric (See Induction,

Electro-Dynamic.)

Induction, ElectrcHDynanilc Electro motive

forces set up bj' induction in conductors which are either actually or practically moved so as to cut the lines of magnetic force.

These electro-motive forces, when permitted to act or neutralize themselves, produce a current.

Electro-dynamic induction occurs only in a magnetic field, the intensity of which is either increasing or decreasing. It may be produced in the following ways, viz.:

(1) By the use of an inducing field of varying magnetic intensity.

Varying the strength of the current and consequently the intensity of its magnetic field, will produce an induction of the circuit on itself, or a self-induction, and will result in extra currents, which are in the opposite direction on closing and in the same direction on opening the circuit; or it will produce induction in neighboring conductors which are

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within the field of the inducing current. (See Self-induction, Mutual Induction, Currents^ Extra.)

(2) By using an inducing field of practically unvarying intensity, and varying the number of lines of magnetic force that pass through a conductor, by moving the conductor through the inducing field so as to cut its lines of force.

Or, the conductor remaining fixed in position, the inducing field is moved past the conductor by moving the electro-magnet, or electric circuit, or permanent magnet producing the field.

Electro-dynamic induction, therefore, includes.

(1) Self-induction.

(2) Mutual Induction, or, as it is sometimes called, Voltaic or Current Induction.

(3) Electro-Magnetic Induction, or Dynamo-Electric Induction.

(4) Magneto-Electric Induction.

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