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Glossary of Technical Terms 51
Douser^— The fire-proof shutter usually mounted on the lamp house of a motion picture projector or stereopticon by means of which the light may be intercepted before it reaches the film or slide.
Dubbing — The re-recording by electrical means of a sound record or portion thereof. The operation may involve transference from film to wax, wax to wax, or wax to film. Dubbing is resorted to for editorial purposes, for changing volume levels, and for changing the recording medium.
Effective Aperture — The largest diameter of a lens available under the conditions considered.
Electrical filter — A network of electric circuit elements designed to pass or suppress one or more bands of frequencies.
Equivalent Focal Length — The equivalent focal length of a combination of lenses is equal to the focal length of a simple thin lens which will give an image of a distant object of the same size as does the combination lens.
Exciter Lamp — The light source used in reproducing sound from a film.
Exposure — (1) The product of time and the illumination incident upon the photographic material. (2) The placing of any sensitive surface under the action of light.
Exterior — ^A scene supposed to be taken out of doors.
Fader — A potentiometer connected between the photo-electric cells of two projectors and the vacuum tube amplifiers, employed to change over from one projector to the other at the end of a reel. It is sometimes connected as an inter-stage coupling within the amplifier systems, and in some cases it is also used as a volume control.
Fade-in — The gradual appearance of the picture from darkness to full screen brilliancy.
Fade-out — The gradual but finally complete disappearance of the screen image. (The opposite of fade-in)
Farad — Unit of measure of electrical capacity of a condenser. The usual unit is the microfarad or one millionth of a farad.
Feature — A pictured story — a plurality of reels in length.
Feed Eeel — The film reel from which the film is pulled by sprockets or other means before passing thru the sound or picture reproducing or recording mechanism.