International Review of Educational Cinematography (Jan-Dec 1932)

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477 crossing the first ones is obtained, which lines are then coloured in blue. The final result of these operations is a film which presents three kinds of stripes or fine lines, two parallel ones in green and red, and the crosswise one in blue. One of the characteristic points of the " Spicer-Dufay " system lies in the method of obtaining the positives. As is known, in mesh systems the positive is generally obtained by a process of inversion. From the inverted original positive the countertypes and the other positives are obtained. In the system under examination, a small number of duplicates are taken from the original and these duplicates are again used to furnish other copies. For printing, an optical process is followed. Inasmuch as between the upper part of the silver image which is on the mesh side, and the mesh itself there is a thin stratum of the thickness of 6-8 micron, it is possible to print perfect copies when wide aperture lenses are used for printing. The printing takes place on emulsions of extreme sensibility with a frequency of about 800 images a minute. In the projection made before the Royal Photographic Society, a film was shown, composed in part of original pictures and in part of copies, and, according to the reports, it was not possible to distinguish the one from the other. CULTURAL SECTION KOCHSTRASSE 6-7, BERLIN S. W. 68 Large Choice of Instructional Films for schools, universities or the theatre. We collaborate with the most important international authorities. Our sphere of activity embraces the following: All branches of natural science. Geography and ethnology; short and long films. Industry and technology. Agriculture. Sports and games. Medicine: popular and technical films. Recreational films. Sound Films and silent Films, We produce cultural " U FAT ON „ films in German, English, French, Czech, Polish, Spanish, and Swedish ASK FOR OUR CATALOGUE Latest projecting apparatus for sound and silent films J '" — Ice ingl.