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January, 1930
The Motion Picture Projectionist
41
Standard Nomenclature
(Continued from page 30) the art of projecting motion pictures.
Projection Distance — The distance between the projection lens and the surface upon which the image is focused.
Projection Lens — The objective which forms upon the screen an image of the lantern slide, film, or other object under examination.
Projection Periods — The total fraction of the picture cycle during which the picture is being projected.
Projection Room — A room or enclosure from which motion pictures are projected.
Props — Contraction of properties. Objects used as accessories in a play.
R
Reactance — That property of an electric current which tends to oppose a varying current within the absorption of energy.
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 1,000 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.
Resistance — The property of an electric circuit which tends to absorb energy due to the passage of a current.
Resonance — Reinforcement of a sound by sympathetic vibration of a material of the same natural period.
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.
Safety Film — Film which is less inflammable than the ordinary nitrate film.
Screen — The surface upon which a picture is optically projected.
Sensitivity — (electric) — The relative efficiency of a device whose response is of a different character from its excitation, such as a microphone or photo electric cell.
Sensitivity — (photo) — The property of photographic emulsion to be (Continued on page 50)
2.5 BI-FOCAL
Super Lite Projection Lens
Adjustable
FOR BOTH SILENT AND SOUND FILM
*/a" & %" Variation in E. F.
AS the name implies this new construction offers the projectionist everything he has been looking for; two focal lengths in one construction.
By rotating the ring on the lens mount the size of the image on the screen can be increased or decreased instantly to take care of the difference between sound and silent film. At the same time an automatic shifting of the center of picture on screen with sound film is provided for.
These features have been made part of the F/2 BiFocal Super-Lite with no sacrifice of the well-known perfect qualities of the Super-Lite which has been used by the best projectionists for the last seven years.
PROJECTION OPTICS CO., INC.
330 Lyell Ave. ROCHESTER, N. Y.
U. S. A.