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April, 1937 • American Cinematographer 135 Fig. 1, A—Left, graphical presentation of performance of the “Triple-5” equipped with metallic mirror as compared with the older 24- inch 5K\V with same mirror. Fig. 1, B—Graphical presentation of performance of the “Triple-5” equipped with glass mirror, as compared with the older 24-inch 5KW with same mirror. spect to the parabolic mirror is a dif- ferential one of suitable ratio. Both the lens and the parabolic mirror come to flood at the same time. Globe Shadow Out The globe shadow, which in the older 24s contributed to the central (lark spot, is eliminated through use of the booster mirror and the lens. Such an arrangement of course does away with the spill ring. The lens automatically takes care of the spill light, throwing it into the center of the field where it is photographically useful. This is a unique feature of the T-5. The differential motion, together with the particular arrangement of mir- rors and the new design B-M lens, gives control of distribution so as to make for uniformity that is practical- ly independent of the degree of spread over the useful working range. In the old 24-inch setup, as the studio technicians will tell you, the metal parabolic mirror does not “carry” so far as the glass parabolic. In the new T-5 setup the carrying dis- tances are equal. Technicians agree that the efficiency of the T-5 surpasses that of any other type of studio lamp using the 5KW globe. This new lamp not only assists the cameraman in keeping a perfect balance of light throughout the set, but it also allows greater economy of operation by giving more light output for the same wattage. T VISUAL EDUCATIONISTS MEET The seventh session of the Nation- al Conference on Visual Education and Film Exhibition (DeVry Founda- tion) will be held at the Francis W. Parker School, 330 Webster avenue, Chicago, June 21, 22, 23 and 24. It will be one of the most representative gatherings of visual educationists in the United States, bringing together school and advertising fraternities and speakers and film exhibitors of national reputation. There will be no admission or membership fees. T NATIONAL CINE EXPANDS For the second time in two years National Cine Laboratories, 20-22 West Twenty-Second street. New York, has been forced to increase its personnel, install additional machinery and equipment and double the space of its laboratory in order to accom- modate the business on hand. Besides manufacturing 35mm and 16mm silent and sound cameras to order. National specializes in repair and maintenance work of all types. Now a new department has been organized to purchase, rent and sell new and used professional cameras and accessories. Fig. 2, A—Left, photograph of field of older 24-inch 5KW equipped with parabolic glass mirror. Fig. 2, B—Center, photograph of field of “Triple-5” equipped with glass parabolic mirror. Fig. 2, C—Right, photograph of field of “Triple-5” equipped with metallic mirror.