Journal of the Society of Motion Picture Engineers (1930-1949)

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218 AMERICAN STANDARDS [J. S. M. P. E. Z22. 18 8-Mm Film; 8-Tooth Projector Sprockets Z22.19 8-Mm Silent Film; Camera Aperture Z22.20 8-Mm Silent Film; Projector Aperture Z22.21 8-Mm Silent Film; Emulsion Position in Camera — Negative Z22.22 8-Mm Silent Film; Emulsion Position in Projector — Positive. For Direct Front Projection Z22.23 8-Mm Silent Film; Projection Reels Z22.34 35-Mm Film; Cutting and Perforating Negative and Positive Raw Stock Z22.35 35-Mm Film; 16-Tooth Projector Sprockets AMERICAN RECOMMENDED PRACTICES Z22.24 16-Mm Silent Film; Film Splices— Negative and Positive Z22.25 16-Mm Sound Film; Film Splices — Negative and Positive Z22 . 26 Sensitometry Z22.27 Photographic Density Z22 . 28 Projection Rooms Z22.29 Projection Screens Z22 . 30 Nomenclature Z22.31 Safety Film Z22 . 32 Fader Setting Instructions Z22.33 Nomenclature for Filters INFORMATIONAL DATA Unit of Photographic Intensity The formulation of these Standards and Recommended Practices is the result of effective collaboration over a long period by a large number of important groups in the motion picture industry. The continued and valuable cooperation of the Research Council of the Academy of Motion Picture Arts and Sciences, and of the Society of Motion Picture Engineers are gratefully acknowledged. The work of preparation and the method of approval were in accordance with the Sectional Committee procedure of the American Standards Association. It will be noted that no references are given in the standards or recommended practices to the originating sources of such material. Where specific publications are mentioned as a matter of information, the references are given in footnotes where the complete publications in question could not conveniently be included in the text.