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THREE-DIMENSIONAL MOTION PICTURES 123 of the ordinary camera or projection lens does not alter the focus of the lens. During the photographing, the anamorphoser merely compresses the image of the lat erally extended scene Into a narrow film space; during projection it expands the projected image to an in creased width on the screen. The cylindrical anamorphoser is not a recent devel opment, even in motion picture work. Ernest Abbe many years ago described all the types used today. At the beginning of the present motion picture era, Zollinger proposed to use them to compress the Image and save expenditure for film. It was only recently, however, that serious attempts were made to rid these anamorphosers of the considerable color and other imagery defects which they exhibited and to correct them to the degree required in motion picture work. Many attempts at Im proving the photographic quality of these systems have not been very sucessful. Only a short time ago Mr. H. W. Lee, in speaking before the Royal Photographic Soci ety, called attention to the fact that "the designing of these systems was exceedingly laborious, and the manu facture of deforming systems with cylindrical lenses far more difficult than of optical systems with spherical surfaces." However, as Is often the case, once a satisfactory solution has been obtained, the problem appears much simpler. As a matter of fact, if certain features of design be adhered to, features that involve among other things the relative indices of the glasses used and the orienta tion of the cemented surfaces and the cambrures of the elements, an extremely simple system that is unusually free from aberrations of every sort can be designed. Figs. A and B show, respectively, a photograph and a cross- section of a fully corrected anamorphoser, and serve to illustrate its simple and compact construction. This anamorphoser is used without any supplementary cor-