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58 Transactions of S.M.P.E., Vol XIII, No. 37, 1929
Q factor^ — The ratio of specular to diffuse density. Owing to scatter of light by photographic materials, the value of Q is greater than unity.
Eeactance — That property of an electric circuit which tends to oppose a varying current without the absorption of energy.
Eeciprocity law — Known as the Bunsen-Roscoe reciprocity law which states that the photo-chemical reaction is proportional to the product of intensity and time.
Recorder Marker — The device for marking the sound negative.
Recording Amplifier — A power amplifier used to operate the recording galvanometer.
Recording Drum — The drum over which the film runs as it is exposed in the recorder.
Recordist — Operator of the sound recorder in commercial practice.
Reel — (a) — The flanged spool upon which film is wound.
(b)— An arbitrary unit of linear measure for film — approximately a thousand feet.
Reflecting Power of a surface — The ratio of the reflected intensity to the incident intensity.
Reflector Arc Lamp — In a motion picture projector, an arc light source in combination with a reflector, to project the light beam through the aperture.
Register^ — To superimpose exactly.
Register — Any indication produced by simulation.
Release — The publication of a moving picture.
Resistance — The property of an electric circuit which tends to absorb energy due to the passage of a current.
Resolving Power of an emulsion — The ability of an emulsion to distinguish detail. Usually expressed as the number of lines and spaces of equal width per millimeter which may be distinguished.
Resonance — Reinforcement of a sound by sympathetic vibration of a material of the same natural period.
Retake — The action of photographing scenes, or the negative resultant therefrom, when the negative or negatives previously obtained are unsatisfactory.
Reverberation — The persistance of sound in an enclosed space. It is measured by the time required for the sound to decrease to one millionth of the initial intensity.