Richardson's handbook of projection (1930)

Page scan 000235 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000235
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:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 1159 bottom of the panel we see two circular plugging jacks. Cables connecting the panel to the projectors are plugged into these. SOUND CHANGE OVER AND VOLUME CONTROL.— In this arrangement it will be observed that "fading" the sound and changing from one to another projector is taken care of by two separate instruments controlled by knobs A and B. When the change-over is to be made, volume is not in any way disturbed, since knob A, which controls it, remains stationary. Knob B handles the change-over, and when it has been swung from ten (10) on one side to ten (10) on the other side, the volume will be exactly what it was on the projector which was cut out, assuming the performance of the exciting lamps and slit optical systems of both projectors to be identical — which thev should be. TO fifiipUHtr/? Figure 420. Knob§ A and B operate precisely the same for both disc record and sound-on-the-film reproduction. The action of this system may be made more clear by an