Nation projector carbons (1935)

Page scan 00092 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00092
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
Date Added:
May 15, 2025
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National Projector Carbons Figure 69 Suprex Arc With Supplementary Magnetic Field and With Axis of Negative Carbon Slightly Lowered when making any repairs to the lamp, to see that the direction of this auxiliary flux is not reversed. Distance from positive crater to reflector is the most important item in the control of this arc. Variation in this distance causes decided variation in both the total screen light and the contrast in brightness between center and edges of the screen. Ratio of positive-to-negative carbon feed should be adjusted so that uniform arc length and position can easily be maintained at the desired operating current. Increasing arc current increases positive-tonegative ratio of carbon consumption and calls for corresponding adjustment of feed ratio. Increasing arc current increases total screen light but does not greatly affect the light distribution, that is, does not greatly modify the relative intensity of illumination at center and edges of the screen. Arc current should be held within the recommended limits for the trim in use. Variation of arc length does not appreciably affect the total light on the screen nor its distribution, provided the arc current and position of positive crater remain unchanged. Extreme variation of arc length, however, introduces operating difficulties. 88