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 #:
000129
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 1053 Threading Sound Film into the Projector IMPORTANT NOTE. — In what follows, when the term "lower sprocket" is used it means the projector mechanism sprocket next below the intermittent sprocket. IN projectors fitted with a sound attachment for the use of film carrying the sound record, there are the usual sprockets, namely, the upper, the intermittent and the lower. In the sound attachment is the "sound" sprocket, which moves the film past the sound aperture; there may or may not be an added sprocket in the lower magazine. There are also idler rollers, "spin wheels," etc., their number, kind and location varying with the type of the sound attachment. The "sound sprocket" runs continuously, and must run with a perfectly steady rotary movement. Also it is absolutely essential that it be kept scrupulously clean. Any deposit upon its face will tend to throw it out of round and cause the film to move past the sound aperture with an uneven movement. Threading the film into any projector mechanism and sound attachment presents one vital problem, namely, the setting of the film in such manner that there will be exactly fourteen and one-half (14j^) inches of film between the center of the projector mechanism aperture and the center of the sound gate aperture. Unless this be the exact condition, there will be an out-of-syn