Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000350
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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WATER COOLING OF INCANDESCENT LAMPS 333 included between the dotted lines and extends from 0.4 micron1 to 0.76 micron; the infra-red, from 0.76 micron to infinity; the ultraviolet, from 0.18 micron to 0.4 micron. It will be noted that the largest part of the energy, as indicated by the areas under the curves, lies in the infra-red. It is this infra-red or heat area that we are interested in reducing. As the temperature TABLE I Proportion of Total Radiant Energy for Various Lamps (Holladay) Lamp Lumens Emitted per Watt /i Maximum Temperature in Deg. K. Average Color Temp. Tc inDeg.K. Maximum Brightness of Filament Candles /(cm.) 9bi Probable Value ol Factor G for the Visible Spectrum Proportion of Total Radiant Energy Emitted in the Visible Spectrum Bv a Black Body at Temp. Tc <i>v By a NonBlack Body Radiator G<t>v (Regular gas filled tungsten lamps): 50 watt tung sten 10.0 2685 2670 469 1.25 0.07165 0.090 75 watt 11.8 2735 2705 563 1.24 0.07592 0.094 100 watt 12.9 2760 2740 605 1.23 0.08020 0.099 200 watt 15.2 2840 2810 781 1.22 0.08897 0.109 300 watt 16.3 2870 2840 862 1.21 0.09314 0.113 500 watt 18.1 2930 2920 1015 1.20 0 . 1003 0.120 1000 watt 20.0 2990 2980 1225 1.19 0.1122 0.133 2000 watt 21.2 3020 3000 1350 1.18 0.1151 0.136 (Special tung sten lamps) : 1000 watt stere optican 24.2 3185 3175 2065 1.16 0 . 1407 0.163 900 watt movie 27.3 3290 3220 2660 1.15 0 . 1476 0.170 10 kw. 31.0 3350 3300 3050 1.14 0.1595 0.182 30 kw. 31.0 3350 3300 3050 1.14 0.1595 0.182 of the radiator is raised, the maximum of the energy curve shifts toward the shorter wave-lengths, and the proportion of energy radiated in the visible region increases. But even at 3000°K. the proportion of the total energy radiated by a black body in the visible spectrum is only about 1 1.5 per cent. Fig. 2 is an energy distribution curve for a black body at 3500° K. In this case, the curve bounding the black area is obtained by multiplying the energy radiated in the vis 1 Micron 1000 millimicrons (mM) = 10,000 Angstroms (A).