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52 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
Film — The ribbon upon which the series of related picture elements is recorded.
Film-Gate — A movable element which, when in operating position holds the film in register against the aperture plate.
Filter factor — The factorial amount by which exposure must be increased to give the same photographic effect when a filter is used as when it is not used. (Note. The quality of the radiation should be the same in both cases.)
Fixing — Making permanent the developed image in a film.
Flash — A short scene, usually not more than three to five feet of film.
Flash-back — A Yerj short cut-back.
Flat — A section of painted canvas, light board, or the like, used in building sets.
Focal length — The distance from the center of a simple thin lens to the image formed by it of a distant object.
Footage — Film length measured in feet.
Foot-Candle — English system unit of illumination. It equals one lumen per square foot — 1.0764 milliphot.
Frame — (noun) — A single picture of the series on a motion picture film.
Frame — (verb) — To bring a frame into register with the aperture during the period of rest.
Frame Line — The dividing line between two frames.
Frequency — The number of repetitions per second of a regularly recurring phenomenon such as the alternations of potential in alternating electric Currents or the vibrations which produce light and sound.
Fundamental — The natural frequency of oscillation for an electrical circuit or a material body.
Gain — The ratio of output energy to input energy of an amplification system, usually measured in transmission units or decibels.
Giain control — A device for varying the gain of an electric amplifier. The gain control commonly used in connection with sound reproduction apparatus consists of a pure resistance so designed that the gain can be varied in multiples of one decibel or one transmission unit.
Galvanometer — An instrument for measuring the intensity of an