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 #:
000241
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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228 J. M. CALHOUN Vol 43, No. 4 use to which such training films are put. The purpose of this paper is to describe a few of the fundamental physical characteristics of motion picture films which, it is hoped, will give a clearer understanding of both nitrate and safety materials. A discussion of how the physical properties of the film affect several specific practical problems is given by R. H. Talbot.1 THE MANUFACTURE OF PHOTOGRAPHIC FILM Present-day motion picture films consist essentially of a lightsensitive gelatin layer coated on a flexible cellulose nitrate or acetate base.* In common with various other plastic materials, photo 01 2345 TIME HOURS FIG. 1. The rate of curing of a green cellulose acetate film base at 200 F. graphic films display many physical characteristics which differ considerably from those of flexible metal films. Therefore, a brief description of the manufacture of photographic film base at this point should assist in the discussion to follow. In the manufacture of both nitrate and safety film base, a viscous honey-like solution or dope of the cellulose derivative in suitable organic solvents, generally containing plasticizers, is first cast upon a smooth metal wheel or roll. Enough solvent evaporates as the wheel revolves so that before one complete revolution, the film skin * Safety film base made by the Eastman Kodak Company may be either cellulose acetate or a mixed cellulose ester such as cellulose acetate propionate or cellulose acetate butyrate. Throughout this paper "cellulose acetate" is used as a general term to include these mixed esters as well as cellulose acetate itself.