F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000247
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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THE PROJECTOR 229 from the aperture is increased. (76) In the Super Simplex, the center of the light beam is 3 15/16 inches from the center of the shutter shaft; hence the edges of the blades must travel at high speed at that point, cutting through the beam diameter very quickly. In all circumstances the master blade of the shutter must be wide enough to shut all light from the screen while the film is in motion over the aperture, except for the slight leeway permissible at the start and stop as Fig. 66. — Simplex disc type rear shutter. previously indicated. In other words, the width of the master blade depends to some extent upon the speed of the intermittent movement. Apparently the speed at which the edges of the master blade move decides, in a measure, the width of the master blade and the other blades. (77) The variation is small, but since the shutter goes into action 96 times each second (two blades, each with two edges), it is an item of importance.