Cinematographic annual : 1931 (1931)

Record Details:

Title:
Cinematographic annual : 1931
Date:
1931
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1931
Leaf #:
000161
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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PROJECTION ARCS 12'.' 100 75 100 75 100 75 100 75 100 75 \Z 100 75 100 75 100 75 -** 14M.M. 55 AMPS. *»* 14 M. M. 45 AMPS. I <f) -" ~~~ ***" J Z 3 13 h AM. 45 AMF 3S > < S* GO < z 13 h AM. 34 AMPS. | I o ■_l z *»* 12 h AM. 34 AMPS. id s u IT) „,«- — ■ 12 r AM. 28 AMF >s -" 10 h AM. 24 AMPS. I J" S.RA. POSITIVE CA RBONS SCREEN LIGI HT * *- ^K VS MOVEMENT OF POSITIVE CRATER ALONG REFLECTOR AXIS — c )ARK CO RNEF ?S 10 MM. 21 AMPS. i I TOWARD REFECTOR— * | MOVEMENT OF POSITIVE CRATER ALONG REFLECTOR AXIS 32-100 0.15 0.10 005 0.0 0.05 0.10 0.15 0.20 0.25 Fig. 4 Change in light on screen ivith respect to movement of positive carbon along the reflector axis. The polar curves for other currents and carbon sizes would be similar in shape and proportional to the candle power values in Fig 2. These polar curves are misleading if they are not carefully analyzed. A better method of expressing the same thing is to compute the quantity of light in each angular segment. These values as well as the total quantity of light and the cumulative percentages are given in Table III.