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

Page scan 000234 from F. H. Richardson's bluebook of projection

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 #:
000234
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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216 RICHARDSON'S BLUEBOOK OF PROJECTION (35) The action is as follows: In part 1, Fig. 62, we see the two parts, cam A carrying the master pin D, which is in continuous rotation so long as the projector is in motion, and star B, which is standing still — one of its four curved surfaces E, being in contact with the surface of cam ring C, in which position it is evident star B cannot be rotated. It must, in fact, remain perfectly still until the two surfaces are released. (36) In this condition the movement is said to be "on the lock." Figure 63. Remembering that cam D rotates continuously in the direction indicated by the arrow, it is evident that, presently pin D will engage with one of the slots in star B, and in that instant surfaces E and C will be out of contact and star B free to rotate under the control of pin D. Study the diagram and you will see how it works. (37) As pin D enters the star slot it moves the star around. The movement is very rapid, but nevertheless by relation the star and its intermittent sprocket (mounted on its shaft) is started slowly and the speed gradually increased to maximum, which is about two or three times the normal 90 feet-per-minute movement of the continuously running film. The star and intermittent sprocket then slows gradually to a full stop, whereupon surfaces E and C re-engage, locking part B im