Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000424
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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404 CINEMATOGRAPHIC ANNUAL Photocell's coating is caesium and a small amount of inert gas is added to the cell to increase sensitivity through ionization. The polarizing photoelectric cell voltage is supplied through the primary winding of a step-down transformer. The secondary of vtt}M)WHt»ni>nh FIGURE 3 Diagram of RCA Photophone sound head showing film travel. this transformer is connected through a fader to a step-up transformer at the amplifier. This arrangement eliminates the use of an amplifier on the projector and a source of possible