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 #:
000164
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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613 HANDBOOK OF PROJECTION FOR connected, as shown in Plate I. Weights 28-28 are normally held in, in the position shown in Plate III, by means of spiral spring 41, which holds part 23 back against ball-bearing 26, whcih in turn presses back part 32, carrying pins 25 which bear on the inner end of arms carrying weights 28-28. Before proceeding any further, study this action closely and get the action clearly fixed in your mind. And now here is how the mechanism operates. The motor runs constantly, but at a speed varying with the arc voltage. Plate III, Figure 213. Its speed increases as the voltage is increased by the increasing length of the arc. As a result of the increased motor speed the tendency of weight 28-28 to be carried out by centrifugal force, against the pull of spring 41, has the effect of overcoming the pull of the spring and forcing part 32, ballbearing 26, and part 23 ahead, which causes tooth 31 to engage with one of the stop teeth, 15, Plate I, on wheel 16. Gears 14, 17 and 29 form what is known as a "differential." Gear 29 is attached to wheel 16, gear 14 to shaft 19 by means of pin 13, and gear 17 to gear 18. Underneath gear 18 is a