F. H. Richardson's bluebook of projection (1942)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000307
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:
July 11, 2024
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THE PROJECTOR ?n models it may operate to lengthen or shorten the path of the film through the mechanism by the necessary fraction of an inch. (21) Fig. 127 illustrates (disassembled) the gate of the Brenkert projector. To the left arc the film tracks, in the center, the pressure pads. When the gate is cl< the pressure pads face the tracks and press the film firmly against them. The pads are actuated by spring tension. This tension must be accurately maintained. Too little will not hold the film firmly enough; will allow it to shift slightly away from the tracks and out of the plane of exact focus. A shift of this kind amounting to a minute fraction of an inch will cause loss of .sharp focus on the screen. Too much pad pressure, on the other hand, will tend to bind the film, increasing the strain on the moving parts of the mechanism, and may possibly cause the film to tear. At the right of Fig. 127 is the opposite or Figure 127 rear view of the center portion of that illustration. The circular opening that fits against the projection lens. In the left-hand portion of the figure, low down, is seen the aperture, with its removable aperture plate, and, some distance above, the "framing" aperture. The last is a feature of this projector. If the film is in frame in the framing aperture, it will be in frame in the projection