Richardson's handbook of projection (1930)

Page scan 000236 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 #:
000236
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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1160 HANDBOOK OF PROJECTION FOR examination of Fig. 420, in which the input from projector No. 2, or turntable No. 2, is connected to terminals A-C, and the input terminals of projector No. 1 to terminals B-C. The diagram of course only shows the essential connections. As the movable arm, represented by the arrow, progresses from position M to position O it is seen that the input from A-C is "faded" out and that from B-C is substituted. Terminals X-Y lead to the input of the amplifying system. The resistance steps of M-N and N-O are so designed that sudden changes in volume of sound are impossible. The resistance steps from ten on the left to ten on the right are merely transitional steps. The operating position is always ten (10), at either end of the scale. Moving knob B moves the arm along the series of resistance coils between M and N and N and O, reducing voltage values progressively to N and increasing them progressively to O. The change-over is made by a quick turn of the knob through its maximum possible movement.