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 #:
000306
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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290 RICHARDSON'S BLVEBOOK OF PROJECTION mechanical connection with the driving motor. It is driven by the take-up, which is a clutch. (19) In one simple form the take-up consists of two fibre or leather discs. One is driven by the projector motor, usually through a bicycle chain connection; this in turn drives the other disc by simple friction, and the other disc drives the reel in the lower magazine. There is a certain amount of slippage between the two discs, which permits the reel to run slower whenever the film, coming down at only 18 inches per second, tends to hold it back. The amount of slippage between the two discs can be controlled by altering the pressure that forces them together. Framing the Picture (20) Fig. 126 is another type of Simplex projector, with film in the process of being threaded. The gate, it will be noted, is open — it is held open through the pressure exerted on a lever by the projectionist's right thumb. A portion of the interior of the soundhead is shown at the bottom of the photograph. Above the projectionist's right wrist is a knob marked "Frame". If through any flaw in the performance of the mechanism or any error in splices in the film, parts of two pictures appear in the aperture, instead of one being completely framed therein, the framing knob is manipulated to correct the condition. In the model here shown, the framing device acts upon the intermittent sprocket; in other Figure 126