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GLOSSARY OF TECHNICAL TERMS USED IN THE MOTION PICTURE INDUSTRY
ACTINIC — Having the property, possessed especially by the
l\ shorter wave lengths of the spectrum, of effecting chemical
changes as in photography.
Acoustic Flat — Set Flat treated to secure sound absorption.
Additive process — Color processes in which various hues are obtained by the addition of two or more of the spectral regions comprising white light.
Alternating Current^ — Current which flows first in one direction and then the reverse, due to the regularly recurring alternation of potential of the generator.
Ampere — The unit of measure of electrical current.
Amplification — The ratio of the voltage or current output to voltage or current input respectively.
Amplification factor — The amplification factor of a three electrode vacuum tube is the ratio of the change in static plate potential to an infinitesimal change in that static grid potential, all other variables remaining constant.
Amplitude — In any vibratory motion, the extent of movement from the mean position to the extreme.
Angle of Incidence — The angle which an incident ray of light forms with the normal to the surface.
Angle of Refiection — The angle which a reflected ray of light forms with the normal to a surface.
Aperture — The opening in the aperture plate at which each individual picture is situated during exposure, printing or projecting respectively.
Aperture Plate — In a motion picture projector, printer, or camera, a plate of metal containing the actual aperture opening.
Arc — A column of very hot light-emitting gas, carrying an electric current sustaining this condition.
Astrogamma — The rate of change of image diameter with log exposure. The slope of the straight line portion of a curve in which diameter is plotted against log lOE.
Attenuation — The inverse of gain measured in the same units as gain.
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