Cinematographic annual : 1931 (1931)

Record Details:

Title:
Cinematographic annual : 1931
Date:
1931
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1931
Leaf #:
000169
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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PROJECTION ARCS 137 It has been the practice for carbon manufacturers to specify the current at which high intensity carbons of various sizes should be burned, but they have been reluctant to specify the voltage. A glance at Fig. 10 will explain the reason for this reticence. Fig. 10. Fig. 11. 120-ampere arcs. This figure gives graphic representations of three 70 volt arcs, but the arc lengths, measured as shown in the figure, vary from 1 J/g in. to % in. In X the negative flame does not touch the lower part of the positive carbon, in Y it just touches it, and in Z it overlaps it considerably. These arcs give entirely different results in quantity