Nation projector carbons (1935)

Page scan 00032 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00032
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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(II tPTEH IN Direct ( lurrent, ( Ad Tj pe Low lntrnsit\ Lamps TSE old type, direct current, low intensity, carbon arc lamp was the first type of lamp used in motion picture projection. The positive carbon is mounted above the negative and slightly inclined from the vertical position so as to expose the crater and permit a greater proportion of the crater light to be picked up by the condenser lens. In one style of lamp, both positive and negative carbons are inclined 20 degrees from the vertical, as shown in Figure 22. In another style, the positive carbon is inclined 15 degrees from the vertical and the negative 10 degrees, as in Figure 23. Figure 22 Figure 23 The optical principle of the old type, D.C. low intensity projection lamps is illustrated diagrammatically in Figure 24. In this lamp, as indicated by the illustration, a cone of illumination approximately 45 degrees in angular diameter is picked up by the condenser lens and focused on the aperture plate. 28