Nation projector carbons (1935)

Page scan 00069 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00069
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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D.C., High Intensity Arc 54. By "area of crater opening" is meant the area of the circle bounded by the rather sharp lip which surrounds the cup shaped crater in the high intensity arc. 5 120 2 t£ 60 National High Intensity Projector Carbons 16 MM \^ 13.6 MM 11 MM ' 9 MM ! I 50 60 70 90 100 110 120 130 140 150 160 Current Amperes Figure 54 Crater Opening vs. Current The cross sectional areas of the 9 mm., 11 mm., 13.6 mm. and 16 mm. high intensity carbons are 64 sq. mm., 95 sq. mm., 145 sq. mm. and 201 sq. mm., respectively. It is obvious from the curves that the areas of crater openings for even the higher currents are much less than the original carbon cross section. The decrease in crater opening for the lower current densities is due in part to the increased spindle or tapering of the portion of the carbon projecting from the positive holder. This increased tapering is due to the decrease in the length of carbon consumed per unit of time with decrease in current, which al 65