Nation projector carbons (1935)

Page scan 00054 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00054
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:
May 30, 2024
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National Projector ( Carbon near the edge of the crater. If the carbon were solid instead of cored, there would be no dip in the intrinsic brilliancy at the center of the crater. How Figure 44 ever, the core is necessary to furnish arc-supporting materials and to maintain the crater position constant with respect to the carbon. Without it, the current would have to be reduced materially and the crater would travel around the end of the carbon and would result in a very unsteady light on the screen. It should be noted that above a certain current for each size carbon there is practically no increase in intrinsic brilliancy of the central part of the crater — merely an increase in crater size and in intrinsic brilliancy near the edges of the crater. It is also evident that after this critical current has been reached, the intrinsic brilliancy is the same for the central portion 60