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

Page scan 000160 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 #:
000160
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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150 Transactions of S.M.P.E., August 1927 T=m (16) The ordinate of this curve at any particular wave-length, X, will be represented by T\. Now the relative intensity of radiation of any particular wavelength which reaches the photographic material is proportional to the product of the ordinates of the curves B, C, and D. Multiplying through at each wave-length and plotting the result as a function of 0.4 300 400 500 600 700 WAVELENGTH (m/Li) Fig. 8. Curves illustrating the determination of filter factor by integration method. wave-length, curve A in Fig. 8 is obtained. The total photographic effect produced on the sensitive material is directly proportional to the shaded area enclosed between the curve and the X-axis. The magnitude of this area, P, can be expressed analytically by the integral A\T\J\d's (17) The area P as given by equation (17) can be determined by mechanical integration using a suitable planimeter. As a matter of fact it is necessary to do this since in general it is impossible to evaluate analytically equations (14), (15), and (16). By using the planimeter the area under curve A shown in Fig. 8 was found to be 0.76Xa.