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

Page scan 000276 from Journal of the Society of Motion Picture Engineers

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 #:
000276
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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1949 PHOTOGRAPHIC DEVELOPERS 273 In Table I, a series of calibration mixes is shown. The absorbancies in the table represent the absorbancies after each was corrected for the absorbancy of the basic mix. TABLE I ABSORBANCY INDICES* Elon, Grams per Liter •A 290 mu a»i A 270 mj* a,3 6.00 0.058 0.010 0.425 0.071 6.00 0.057 0.010 0.426 0.071 4.02 0.039 0.010 0.286 0.071 4.00 0.042 0.010 0.284 0.071 3.00 0.030 0.010 0.217 0.072 2.00 0.021 0.010 0.141 0.071 2.00 0.022 0.011 0.141 0.071 1.00 0.011 0.011 0.070 0.070 Avg. 0.010 Avg. 0.071 Hydroquinone, Grams per Liter ^290 mit as2 ^4.270 mft 0S4 6.00 1.361 0.227 0.494 0.082 6.00 1.355 0.226 0.492 0.082 5.00 1.129 0.226 0.410 0.082 5.00 1.129 0.226 0.410 0.082 4.00 0.910 0.227 0.333 0.083 2.11 0.479 0.227 0.175 0.083 Avg. 0.226 Avg. 0.082 * The slit widths used for the analyses were 0.43 mm at 270 millimicrons and 0.36 mm at 290 millimicrons, corresponding to spectral bandwidths of 1.3 and 1.4 millimicrons, respectively. The absorbancy indices have been found valid for use in analyses on three different Beckman Spectrophotometers. CALCULATION AND USE OF EQUATIONS One method of calculating the concentration of Elon and hydroquinone is to use equations derived from the fundamental relationship given in (1). = ~T Introducing the absorbancy indices from Table I, the following equations are obtained for each wavelength :