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60 Transactions of S.M.P.E., Vol. XUI, No. 37, 1929
Slide — (Sterfio slide) — See "Lantern Slide."
Slit — The mechanical slit, a part of the optical system, the image of which is focused on the film.
Slit image — The image of the slit produced by the objective lens of the optical system.
Sound Attachment — Any mechanism designed as an attachment to standard projectors to permit reproduction of synchronized sounds and picture.
Sound Gate — A gate similar to that used in picture projectors through which the film is pulled past the reproducing light beam in gate-type machines.
Sound Head — Compartment on the projector which contains sound reproducing systems and mechanism for guiding and driving film.
Sound Negative — Negative on which sound track only is recorded.
Sound-on-disc — A sound motion picture system in which sound is supplied to the picture from a phonography-type record that is run with the picture on suitable turnable apparatus.
Sound-on-film — A sound motion picture system in which sound is synchronously applied to the picture in the form of a sound track photographed alongside the picture frames in definite (or fixed) relation thereto.
Sound Overshooting — As applied to variable area recording, this refers to the condition where the peaks along the sound track extend beyond the limits of the track and are accordingly cut off during reproduction, resulting in deterioration of quality. As applied to variable density recording, it applies to areas of sound track of excessive or incorrect opacity and has a similar result.
Sound Pick-up — Device or system for reproducing sound from film or disc. In sound-on-film, the sound pick-up is an optical-electrical system contained in a compartment on the projector. In sound-on-disc, the pick-up is an electro-magnetic device which transforms the physical variations in the grooves of the disc into electrical variations.
Sound Recorder — An optical-electrical mechanical system for changing electrical impulses, generated by sound striking a microphone, into corresponding light variations that are photographed on the film or into mechanical vibrations which are recorded on a wax disc.