International projectionist (Jan-Dec 1935)

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April 1935 INTERNATIONAL PROJECTIONIST 27 the intermittent works cold: only the film is exposed to the heat, whereas in the claw type machine the claw and pins are continuously exposed to the heat, and subject to expansion. Arc, Lenses, and Screen The lamp is a Hall & Connolly HC-10, of the thermostatically-controlled type, using 13.6-mm. positive and 11-mm. metal-coated negative carbons. The current is 165 to 200 amperes. The condensers are standard 5127 for the rear, and 5128 for the front element. The position of the condenser lenses with respect to the arc and projector differs from that in ordinary theatre projection, owing to the necessity of eliminating the hot spot which ordinarily would appear upon the screen after the re-photographing. The projection lenses are the Apermax-Cooke 5H-inch f/1.9, and the 6J^inch f/2.3. These lenses proved to be superior to any other lenses tested so far. In the beginning a Trans-Lux screen was used, having very good diffusion but low transmission, thereby handicapping scenes requiring big picture sizes. However, it proved very satisfactory so far as the hot spot and satisfactory viewing angle were concerned. Later a rear projection screen made by Fox on the West Coast was obtained, having nearly double the transmission of the Trans-Lux screen but a narrower satisfactory viewing angle. Photographing the plate requires experience and skill on the part of the cameraman in charge. He must visualize in advance what the projected image should be, and looking through the finder of the camera when photographing the plate he must take into consideration the foreground that will be in front of the screen when making the composite scene. Moreover, he must judge accurately the exposure required for a negative density contrast of 0.80 to 0.95 after the film is normally developed. When buildings or other subjects that must appear steady on the screen are photographed, the camera must stand very steadily upon its tripod, which may have to be tied down. When photographing from bridges, long focal length lenses must be avoided because of the vibration of the bridge. Wind also causes unsteady negatives, and it is suggested that plates be not photographed on windy days. Careful Advance Tests From the finished negative plate three positives are made : one called "normal", another one printer-light higher, and the third one printer-light lower. From these prints the one best suited to the composite scene is chosen. These prints are special in so far as they are made on a selected step printer. For lining up the scene an ordinary print made on a con DeVRY theatre sound Streamlined — All enclosed-dust-proof. The New DeVry DeLuxe 2000 ft. 35mm Reel Clock spring steel rims and spokes always remain in true alignment. AUTOMATIC THREADING The "Film Saving" Reel, ready for delivery now. De signed from the start for Both sound and picture. All lamps — Fewer parts — Lower Costs. Wide frequency range. Attend DeVry Free Summer School of Projection, Chicago, June 24 to 28. Herman A. DeVry, Inc. Dept. K., 1111 Center St., Chicago 347 Madison Ave., New York For Perfect Projection Use EXTRA HEAT-RESISTING CONDENSERS Made of Selected "Pyrex" Brand Glass are ground and highly polished to precision accuracy in curvature and focus — will not discolor — are carefully tempered to withstand extreme changes of temperature, for which Pyrex Glass is so well known — give maximum light value for projection and spotlight purposes. MATISSE FS C CONDENSERS Ask your dealer for No. 242M price list FISH-SCHURMAN CORPORATION 230 EAST 45th STREET NEW YORK, N. Y. tinuous-running Bell & Howell printer is The actual operation is as follows: Reused. Each work print is preceded by quired sets and props are built and 15 feet of a sharp criss-cross chart to erected before the translucent screen, permit focusing the picture accurately. Necessary lighting equipment is approx