Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000125
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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MANAGERS AND PROJECTIONISTS 1049 The Sound Gate THE "sound gate" is an assemblage of springs and pressure shoes designed to hold the sound track snugly against the sound aperture, much as the projector gate or "film trap" holds the film in place over the projector aperture. The sound gate must have careful attention from the projectionist before he threads any film into it. If this attention is not given, the sound gate may and probably will "get back" by seriously injuring or perhaps entirely ruining a lot of sound track, which means, in effect, ruining just that much of the print. The whole purpose of the sound gate is to hold the sound track snugly against the sound aperture, which faces the photo-electric cell. Because of this there is always the tendency for the pressure exerted at this point to cause the metal, polished though it be, to pick up a deposit of emulsion or of the surplus cement often found in dried condition upon the surface of the film at carelessly made splices. With some apparatus such a deposit cannot occur in such way as to injure the sound band. With other apparatus such a deposit may begin at any time. It cannot, of course, be remedied until the film being projected has been finished, but is not likely to grow sufficiently to do damage during that period. It is evident that, if permitted to remain, it will inevitably increase in size and soon may become large enough to inflict