Transactions of the Society of Motion Picture Engineers (1922)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1922
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1922)
Leaf #:
00039
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
December 28, 2023
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TABLE 3— EFFECT OF CHANGE IN FOTENTIAT. ON 5.5 AND SO-AMPERE, 28-32 VOLT INCANDESCENT PROJECTOR LAMPS Volts Amps 30 5.59 33 5.87 36 6.17 39 6.46 42 6.74 45 7.02 48 7.30 23.5 26 24.8 27 26.9 28 28.4 29 29.9 30 31.8 31 33.5 32 35.2 33 37.1 34 C P With Mirror I ^^'atts 5.5-Ampere I amp C P-j-.A] 168 710 7900 194 950 10600 224 1250 13900 252 1600 17800 283 1980 22000 316 2490 :;!7700 350 2960 32900 30-AMPERE LAMP 611 2310 9240 670 2890 11630 753 3910 l.'6J0 823 4070 16300 897 5050 20200 987 5980 23900 1072 6960 27800 1161 7890 31600 1260 9000 36000 Temp. °K 3000 3100 3185 3270 3355 .3435 3510 3010 3067 3150 3210 3297 3355 3445 3505 3565 A pprox Life 100 32 . 1 12. f 2J90. 1080. 442. 238. 100. 58. 26. 15. 9. where A^ is the proportion of the area the filament itself fills, Ag the proportion filled by the image reflected in the mirror, i the average specific brilliancy of the tungsten, depending upon its temperature, emissivity, and shape, and m. the efficiency of the reflection, being LOO .60 .€tO AO .20 "S .0^ .oz .01 .QQ& .006 .004 .002 \ \ \ \ (^ ] B^ \ \ S \ \ \ \ \ \ s \ \ \ \ \ \ \ \ \ s \ v N S — — — *'2 « 6 8 10 IZ 14 16 18 ZO ZZ ^'^ Z6 Z& 30 3Z 34 36 Irxtrinsic Dr'lliancy times 10 Figure 12 29