Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000276
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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1950 DECOMPOSITION OF FILM 271 inhaled, can be fatal. Shortage of municipal water supplies in many areas presents an acute control problem definitely requiring the constant maintenance of every safeguard. METHODS OF FIRE PREVENTION The results obtained in the Bureau of Standards tests indicate that good film does not self-ignite at ordinary storage temperatures. Therefore, the logical approach is to remove from storage all film showing signs of deterioration. Such film can readily be found by regu 400 200 100 UPPER LIMIT Of ERATURE RECORDING NSTRUMENT-\ | OCIMUM TEMPERATURE T KNOWN— v FILM IGNITED F1LM TEMPERATURE: AMBIENT TEMPERATURE: io6°F, I. M|. M|.M I TIME Fig. 3. Temperature during the critical period in which a film spontaneously ignited. larly scheduled inspection of stored film stocks. Inspecting personnel should be trained to recognize decomposing film by appearance, with its condition classified according to the following categories. In the first stage of deterioration the photographic portion usually shows an amber discoloration with fading of the picture image. In the second stage, the emulsion becomes adhesive and the film convolutions tend to stick together during unrolling. Rolls of third-stage film have annular portions which are soft, contain gas bubbles, and emit a noxious odor easily recognizable. In the fourth stage of deterioration, the en