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50 Transactions of S.M.P.E., Vol. Xlll, No. 37, 1929
lute (Centigrade degrees +273) at wliicli a true black body will match the color of the source.
Condenser — The lens combination which refracts the diverging rays of the luminant into the projection lens.
Collecting Lens — The lens of the condenser nearest the
light source. Converging Lens — The lens nearest the objective. Center Lens — The lens of a three lens combination lying between the collecting lens and the converging lens.
Contrast — The ratio of the highest to the lowest value of transmission. The range of tones in a negative or print.
Cooling Plate — A shield or baffle, composed of one or more plates, mounted between the light source and the mechanism, and usually attached to the latter but spaced therefrom, to prevent overheating the mechanism.
Cut-back — rScenes which are returns to previous action.
Cut-in — Anything inserted in a scene which breaks its continuity.
Cutting — Editing a picture by eliminating unsuitable subject matter therefrom.
Decibel — The unit of transmission efficiency which equals ten times the logarithm to the base 10 of the power ratio. Photographic density may be converted into decibels by multiplying by 20,
Density — (Photographic) The logarithm to the base 10 of opacity.
Developing — Chemically treating exposed film to make the latent image visible.
Diffuse density — -The value of density in which the total transmitted intensity is measured. (This value of density is applicable to contact printing relations.)
Direct current — An uniform flow of electric current in one direction as from a battery or direct current generator.
Director — The person w^ho superintends the. actual production of the motion picture.
Dissolve — The gradual transition of one scene into another.
Distortion (of Sound)— Modification of sound caused by the means employed in its recording and reproduction.
Double Exposure — ^The exposure of a negative film in a camera twice before development.
Double Printing — The exposure of a sensitive film under two negatives prior to development.