Nation projector carbons (1935)

Page scan 00036 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00036
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 < larbone \r< Traveling or Wandering has already been stated, before the advent of metal-coated negative carbons the common practice was to use large diameter regular solid or cored projector carbons in the lower holder. This negative carbon in most cases was slightly smaller in diameter than the positive, although in (Others, the same diameter wTas used. With the large blunt point on the negative, it was not possible to keep the arc steady and in one spot — see Figure 25 showing a M-inch cored upper operated with a s-inch lower. This combination resulted in an unsteady light on the screen. When operated with a short arc to reduce traveling and make a steadier light, the large gpj (negative carbon in some instances masked or obstructed some of the light from the positive crater and this naturally decreased illumination. Obviously the thing to do was to use a negative of smaller diameter. A plain carbon would not carry the current so a metal coating was applied and the Orotip Carbon of today is the Figure 25 . *^ J result. While the majority of theatres in this country using the type of lamp discussed in this chapter now burn Orotip negative carbons, there are still some theatres using the old style combinations with large diameter, uncoated negatives. For best results, the use of Orotip negative carbons is strongly recommended. Such a trim is illustrated in Figure 26. Figu 32