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54 CINEMATOGRAPHIC AXNl'AL
available which enables equally good results to be obtained with simpler constructions, this consideration very effectively sets a limit to the useful speed of a lens. Altogether there is little reason to expect useful lenses of higher speeds than are now available in the range of focal lengths now employed.
The optical systems involved in color photography are interesting but it is felt that to include any adequate survey of them would extend this article beyond reasonable limits. The late Professor E. J. Wall has collected practically all such information into his book on Color Photography to which the reader is referred. He has also devoted his time in serious fashion to compiling an analysis of the various proposals within the field of stereoscopic motion pictures, a field regarded as hopeless by the optical engineer but glittering with promise for the amateur.
A short list of references is appended for the sake of those who might wish to consult them.
References
1. Die Hohlspiegel, Dr. A. Sonnefeld, Published by the Union Deutsche Verlagsgescllschaft, Berlin.
2. Ostwald's Klassikerder Exacten Wissenschaften, No. 219. Published by the Akademische Verlagsgesellschaft, M. B. H. at Leipzig.
3. Theorie und Geschichte des Photographischen Objektivs, M. von Rohr. Julius Springer, Berlin, Publisher.
4. Photography Principles and Practice, Neblette. Published by D. Van Nostrand Company, New York.
5. Optics for Photographers, Harting. Published in American Photography beginning with Volume V, No. 1, -January, 1911.
6. History of Three Color Photography, Wall. The American Photographic Publishing Co., Boston.
7. Photographic Optics and Color Photography, G. Lindsay Johnson. D. Van Nostrand Co., New York.
8. Stereoscopic Cinematography, E. J. Wall, Trans. S. M. P. E., Volume X. Page 326.