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Glossary of Technical Terms 59
Rewind — Tlie process of reversing the winding of a film, Tisnally so that the end to be first projected shall lie on the outside of the roll.
Eewinder^ — The mechanism by which rewinding is accomplished.
Safety Film — Film which is less inflammable than the ordinary nitrate film.
Scene — A division of the story showing continuous action in the same locale or set, and usually taken from the same point of view.
Scenario — A general description of the action of a proposed motion picture.
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 rendered developable by the action of light.
Sensitometry (Photographic) — The science of analyzing the response of photographic materials to radiation. The term ''sensitometry" as commonly used in the motion picture industry refers to photographic sensitometry. The word itself of course means the measurement of sensitivity and hence may be applied to other things than photographic materials. For instance, visual sensitometry refers to the measurement of the various responses of the eye to radiant energy.
Shadow Scratch — See Optical Scratch.
Sharpness — The rate of change of density with distance from the edge of a photographic image.
Shooting a scene — Photographing the scene.
Shoulder — The over-exposure region of the characteristic curve of a photographic emulsion. In this region a linear relation does not exist between lOglO Exposure and density. Throughout this region the slope decreases with increasing exposure.
Shutter — A moving element, usually rotating, which intercepts the beam of light in a motion picture camera, projector or printer, one or more times during each cycle.
Single Picture Crank (sometimes referred to as trick spindle) — A crank on a motion picture camera which makes one exposure at each complete revolution.