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 #:
00029
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
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

26 BRUNNER, MEANS, AND ZAPPERT July TABLE I First Developer— A-502 Water, 65 to 90 degrees Fahrenheit 750 milliliters Metol 3 grams Sodium Sulfite 50 grams Hydroquinone 6 grains Sodium Carbonate Monohydrate 40 grams Sodium Thiocyanate 2 grams Potassium Bromide 2 grams Water to make 1 liter Color Developer— A-605 Water, 65 to 70 degrees Fahrenheit 750 milliliters Calgon 1 gram Sodium Bisulfite 2 grams Diethyl-p-Phenylenediamine Hydrochloride 4 grams Sodium Carbonate Monohydrate 67 . 5 grams Potassium Bromide 1 gram Water to make 1 liter Determination of Metol and Hydroquinone The first developer used in the Ansco color process is similar to the usual reversal first developer containing sodium thiocyanate. All the earlier methods for the determination of metol and hydroquinone were based on two separate extractions of the developing agents and possessed several disadvantages, one of which was the determination of metol by difference. Baumbach2 made a definite advance in 1946 by describing a single methyl acetate extraction method involving a potentiometric acid titration of metol followed by oxidation of both metol and hydroquinone with iodine. Shaner and Sparks3 modified this by using a U-tube extractor and methyl ethyl ketone as solvent. The difficulty in determining the end point in the iodine titration is a disadvantage common to both methods. When the pH is maintained at 6.5 to 7.0, the solution is so highly colored by oxidation products that it is extremely difficult to see the blue starch-iodine end-point. Oxidation at low pH values results in a nearly colorless solution, but the iodine oxidation is not quantitative. Because of the small sample used in the Shaner and Sparks procedure, the volume of acid needed to titrate the metol is very small. Four developers, cited by these authors, containing 2.0, 3.0, 0.22, and 0.31 grams of metol per liter, require only 1.16, 1.74, 0.13, and 0.18 milliliters of 0.1 normal acid when determined in accordance with their