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 #:
000312
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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March, 1930] HIGH INTENSITY ARCS 295 9 mm. and 13.6 mm. carbons is the same as with the 16 mm. carbons although to a somewhat smaller degree. The angular distributions of candle power from the positive craters of 9, 13.6, and 16 mm. carbons in the horizontal plane in a total angle of 80° are given in Fig. 4 for a number of different currents. The NATIONAL HIGH INTENSITY CARBONS CAN M.E PO WER DISTRIBUTION OF CRAT IN HORIZONTAL PLANE LR LIG -IT 90000 8QQOO 70000 6QOOO 5QDOO 40000 30000 20000 / >^ ^ K / \ \ ^ 6 MM. NATION U. HIGH INTCN' 150 AMPS. 80 VOLTS >ITY C* RBON \ S •*^. •— • — •• ^^~ X 3.6 MM . Npmo MftL HIG 120 72 H INTE A.MPS. VOLTS «ITY IARBON _, "Vs^^_^ -~ ^ 3.6 MM NATIOI 4AL HIG H INTE 4SITY C ^^^ ARBON ^ ^^ ^=39 MM. _ i ii NATION 70 — in AL HIG VOLTS ~~ 4 INTE •43ITY — ^^ :ARBOh ^ 0 51 VOLTS 40" 30* 20' 10 10 20' 30° HORIZONTAL ANGLE FROM M\5 OF POSITIVE CARBON FIG. 4. Angular distribution of candle power from positive craters of various carbons. candle power is slightly lower directly in front of the crater than at 10° to 20° on either side. The candle power holds up remarkably well to the 40° limit measured and is only 10 to 17 per cent lower at 40° than at the center. This accounts for the decided increase in the useful light from the high intensity arc when a mirror or condensers of large effective angle10 are substituted for the old style condensing lenses of small effective angle. The light distribution is approximately the same for the different