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38o SOUND MOTION PICTURES
Electrolyte : A conductive liquid, such as the sulphuric acid solution in a storage cell. (Liquid in a storage battery.)
Electromotive force: The electric force that tends to produce a flow of electric current in a circuit; abbreviated e.m.f.; also called "potential difference," "electric pressure," "voltage."
Electron: The smallest electric charge, and negative in potential. A drift of electrons proceeds from negative to positive parts of a circuit and constitutes a flow of electric "current" that is conventionally taken as proceeding in the opposite direction (i. e., from positive to negative). The ultimate particle of negative electricity, which plays a fundamental part in the constitution of matter as well as in the electric current. Radioactive emanations, electric discharges, etc., consist of streams of electrons.
Electron tube: A vacuum tube depending for its operation upon electrons passing through it.
Fader: Used in connection with sound equipment, Western Electric. The fader is essentially a double "volume control," used to increase or decrease the volume heard from a reproducing equipment.
Filter: A system of condensers, choke coils, and resistors, or some of them, offering low impedance to certain frequencies but high impedance to others.
Frequency: The number of cycles of oscillation in each unit of time, usually given in terms of cycles per second; in alternating currents, the rapid reversal of the current through a circuit. Thus, we speak of a sixty-cycle current as one which has sixty complete reversals per second or a frequency of sixty cycles.
Frequency changer: A device that converts alternating current of one frequency into alternating current of another frequency; the usual conversion is a doubling or tripling of frequency.
Grid: The interposed screenlike control electrode of an audion.