Handbook of projection for theatre managers and motion picture projectionists ([1922])

Page scan 000905 from Handbook of projection for theatre managers and motion picture projectionists

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
000905
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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870 HANDBOOK OF PROJECTION FOR Weaver Douser AN ELECTRIC DOUSER.— The change-over is facilitated by what is known as the Weaver Electric Douser, which works by magnetic action and cuts off the light from one projector, substituting that of the other simultaneously, or at least in the very small fraction of a second. The action is in fact so rapid that it is practically instantaneous. Figure 363-A. In Fig. 363-A we have the photographic view of the douser, and in Figs. 363-B and 363-C wiring diagrams for two and three-projector installations. It is also quite possible to add other switches, so that the douser may be set into action from any desired point in the projection room, though this latter we