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 #:
000247
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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MANAGERS AND PROJECTIONISTS 695 In contrast with the position of the rollers shown in figure A rollers No. 1 and 4 are now at the outer circumference and rollers No. 2 and 3 are at the inner circumference of the locking ring and the pin across spindle has made one quarter revolution and pulled the film down a distance equal to the height of one frame or picture. The rollers can only move in the path of a circle. As rollers No. 2 and 4 travel through their respective slots it might seem that they must travel in a straight line. This, however, is not the case. Since the locking ring is revolving the position of the slots constantly change so that their straight lines intersect the circular path of the rollers at successively different points resulting in a rotary motion being imparted to the pin cross spindle. OLD STYLE P O W E R'S MOTOR DRIVES.— When using old style Power's motor drives it ^ i s important that you have the friction pulley in alignment with disc on motor. When starting show, begin with slow speed and increase until you reach the required projection speed. When motor drive is not in use, see that R<92 Plate 12, Figure 246. friction driving disc R-15, Plate 13, is not bearing on disc R-13, Plate 13. It should be free from contact. 1. Motor should be kept free from dust, and do not allow oil to get into the motor windings. 2. Belt on V pulley should not be too tight. 3. Never put too much pressure on the adjusting screw