Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000212
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 18, 2024
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661 HANDBOOK OF PROJECTION FOR precise point at which the string starts to move is determined. Exactly the same process, in reverse, may be employed to find the point at which the sprocket comes to rest. Move the flywheel until the sprocket is almost at rest, and again place the spring against one of the teeth of the sprocket. It will, of course, be bowed a bit less than in the former case, since the sprocket tooth is not yet fully advanced to the lock position. Now move the wheel until the sprocket comes to rest, the exact point being that at which the spring ceases to move. To measure the intermittent ratio we must first understand that the flywheel of a professional projector makes exactly one complete revolution to each complete picture cycle. In other words, from the time the intermittent sprocket starts to move until it starts to move the next time, the flywheel has made precisely one complete revolution. It therefore follows that since the edge of the face of the flywheel is a circle, and since there are 360 degrees in every circle, if we can measure, in degrees, the exact distance the Figure 230b