Society of Motion Picture Engineers : incorporation and by-laws (1927)

Page scan 000153 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1927
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1927)
Leaf #:
000153
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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Light Filters — Jones 143 In Fig. 3, curve A, the spectrophotometric density curve for the filter illustrated in Fig. 2 is shown. Now suppose it is desired to determine the effect upon the spectral absorption of increased concentration of dye used in making the filter. Let the required concentrations be 2 and 4 times that represented by curve A in which it may be assumed that concentration is x grams per unit area. Let Dx be the density at some particular wave-length X as read 300 400 500 600 700 WAVELENGTH (m /ji) Fig. 3. Spectrophotometric density curves of green filter, illustrating relation between density and concentration and effect of surface reflection. , from curve A, for concentration 2x the required density will be given by Z)\=[(Z)x-.036)2] + 0.036 and for a concentration of 4x D'\=[(Dx .036)4] + 0.036. Computing the necessary values for various wave-lengths and plotting, the curves B and C are obtained. It is interesting to compare the result obtained by increasing the concentration 4 times, curve C, with that obtained by using four layers of the original film as shown by curve A. This case is represented by curve D, the ordinates of which were obtained by multiplying the ordinates of curve A by 4.