Society of Motion Picture Engineers : incorporation and by-laws (1923)

Page scan 000433 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1923
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1923)
Leaf #:
000433
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
September 12, 2024
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Fig. o. Photograph of assembled calorimeter oven and placed (opened part down) over the film sprocket. As the warm film is surrounded by air at constant temperature and a relatively thick layer of wood, and as the interval needed to remove the box from the oven and place it in the above position is only a few seconds, the change in heat content of the film is very small. There is a possibility of a small loss of heat occurring as the film passes over the sprocket. The film was introduced into the inner chamber at various speeds ranging from (85-240) feet per minute. From a few preliminary trials, it was ascertained that the film should, be stored in the oven at least 24 hours to insure temperature equilibrium. It may be of interest at this point to consider the probable error that may be expected in measurements of the specific heat. Following are given the approximate magnitudes of the various factors concerned and the uncertainty in measurement of each. Mass of film 500 ± 1 gram Change in temperature of calorimeter 4.00 + .03° Water equivalent in calorimeter 961+6 gram calories Difference between the initial and final temperature 12.00 + .15° of the film Using these values, it can be shown that the percentage deviation of a single determination will be ±1.58% and the percentage deviation of the mean of four determinations will be ± .8%. 97