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 #:
000224
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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Sept., 1944 REPRODUCTION OF COLOR FILM SOUND RECORDS 213 further investigations will show the way to make cells with still higher sensitivities. The maximum of the spectral distribution may be shifted toward the red by about 100 m/x by sensitization with oxygen. Therefore, considerable specific adaptation to the spectral characteristics of any given film is possible. It will be of interest here to mention that even Schinzel's suggestion,2 the use of a white-sensitive cell, can be carried out practically. By combination of a transparent Cs, Sb layer with a caesium oxide layer12 in one cell, a photocell can be made which has a uniform sensitivity over the entire visible spectrum up to the near infrared. However, this cell may be expensive, because its preparation requires the use of 2 different sensitization methods. In spite of a multitude of publications,7 it is not yet clear in all details what causes the great quantum efficiency of the Cs, Sb layers (maximum quantum efficiency of 30 per cent in comparison with 1 per cent with caesium oxide cathodes). It seems that the electrons are liberated in a polyatomic layer of an alloy of Cs and Sb, whereby a fixed relation between both alloy components is necessary for the best results. In order to reduce the work function, a single-atomic Cs layer must be present on the surface of the alloy. REFERENCES 1 OTIS, R. M.: "The Multicolor Process," /. Soc. Mot. Pict. Eng., XVII, 1 (July, 1931), p. 5, in particular pp. 9-10; XVI, 2 (Feb., 1931), p. 151. 2 SCHINZEL, K. : Kinotechnik, 11 (1929), p. 464; U. S. Pat. 1,675,894. 3 D. R. PAT. 614,243 (Feb., 1932). 4 GORISCH, R.: Beitrage zur Kenntnis des Grundgerausches von Tonfilmen, Diss. Univ. Berlin 1935, S. 20-21 ; appeared also in a series of sound film technical publications of the Klangfilm G.m.b.H., Berlin. 5 KUSTER, A. : Kinotechnik, 21 (1939), p. 167, especially p. 169 et seq. 6 Cf., e.g., GORLICH, P. '.Kinotechnik, 17 (1935), p. 307. 7 GORLICH, P.: Zeitschr.f. Phys, 116 (1940), p. 704. 8 KLUGE, W.: Phys. Zeitschr, 34 (1933), p. 115. 9 ELSTER, J., AND GEITEL, H.: Phys. Zeitschr, 12 (1911), p. 609. 10 GORLICH, P.: Zeitschr.f. Phys, 101 (1936), p. 335; Phil. Mag, 25 (1938), p. 256; D. R. PAT. 713,401 (Aug., 1935); U. S. Pat. 2,122,860 (Aug., 1936), Brit. Pat. 460,012 (Jan., 1937). 11 GORLICH, P.: J. Opt. Soc. Am., 31 (1941), p. 504. 12 GORLICH, P.. AND LANG. W. : ZJ. Instrkde.. 57 (1937). p, 249.