American cinematographer (Jan-Dec 1931)

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March, 1931 AMERICAN C I N E M ATOG R A P H E R Thirty-nine Bed & Howell Announce New Lamp for 16 MM. Projection THE FIRST 75 volt 375 watt lamp ever perfected for 16 mm. movie projection has just been announced by Bell & Howell. Said to achieve a light intensity more than 40 per cent greater than was previously available for this type of projection, it depends primarily for its unusual results on a tremendous light concentration interestingly exemplified by the accompanying illustration. In the picture one of these powerful little lamps is placed alongside of six 60 watt electric light bulbs such as are used in the home. When one considers that this new type projector lamp is actually only about one-third as large as one of the 60 watt bulbs and yet furnishes more illumination than all six of the latter combined, he can appreciate something of what has been accomplished. (Repeated scientific tests, made under widely varying condi: tions, are said to justify the statement that Filmo projectors, when equipped with this new lamp, can easily project black and white pictures 12 feet wide with entirely satisfactory distinctness and can attain excellent Kodacolor projection on a larger than ordinary screen. The problem presented to the illumination engineers in developing this new lamp was to concentrate the maximum permissible amount of light upon the small 16 mm. film. Not only was it desirable to increase the amount of illumination so as to permit showing a large picture of sufficient brightness, but the light must be concentrated in as small a source as possible to focus properly with the optical train of lenses employed in projection, all of which has been successfully accomplished. It is stated that naturally the new lamp, because of the great concentration of light, generates a fair amount of heat, but a projector equipped with an efficient fan cooling system satisfactorily takes care of this situation. [This new 375 watt lamp has opened up a tremendous field for the 16 mm. film. The perfectly safe little 16 mm. projector can now go into the auditorium and assembly hall and show pictures of entirely adequate size, clearness, and brilliance. This great step forward will be especially welcomed in the church and educational fields. Home movie projectionists will also appreciate the possibility of securing theatrical brilliance on a larger screen. The notable improvement made possible in Kodacolor projection is not the least of the triumphs scored by this new lamp. Movietone in British Federation ONDON — British Movietone News, Ltd., has been elected member of the Federation of British Industries, and is the first newsreel firm to be so honored by this organization. L° Novel Lightning Researches by Amateur Photographers A STUDY of French lightning is being made by amateur photographers organized by the Astronomical Society of France. Already many photographs of lightning flashes have been sent in and studied by the Society's experts. It has been found that these flashes seldom if ever are single, but that there are always a number of back and forth surges of electricity between the earth and the clouds, almost like an electric arc following the path of the first spark where this spark has broken down billions of atoms of the air gases and to make the path more highly conductive for electricity. This is a conclusion already considered probable by American observers using high-speed motion picture cameras. Another and less well-known conclusion of the French study is that the path of a lightning flash may continue to glow for an appreciable time after the electric flashes have ceased entirely, this glow presumably being caused by the re-combinations of the atoms of air gases decomposed by electricity. One of the chief needs of further lightning study, it is stated by Dr. Emile Touchet, vice-president of the society, is for additional photographs of lightning flashes by cameras with plates moving at high speed, so that the direction of the flash and the nature of its motion through the air can be determined. Another need is for stereoscopic photographs of the same lightning flash from two or more different points at measured distances apart on the ground, so that the heights and distances of the two ends of the flash can be computed. Members of the society are now being asked to attempt these additional tests. Dyer Production Manager EDWIN L. DYER, A.S.C., has been made Production Manager of the Southern Division of the Motion Picture Advertising Service Company, Inc., with his headquarters at New Orleans, La. He writes that natural color photography will play an important part in these films within a short time. AMATEURS! Keep Step with the Professionals by Reading The Technical Cinematic Magazine of the Motion Picture Industry. . The AMERICAN • CINEMATOGRAPHER Published in Hollywood by the American Society of Cinematographers, the leading professional cameramen of the world. You cannot afford to be without it. For Amateurs — Service department, special technical articles by the world's greatest authorities on cinematographic science. _-[F"iiri_and Mail Today) American Cinematographer, 1222 Guaranty Building, Hollywood, Calif. Gentlemen: Please find enclosed three dollars ($4.00 for foreign rate) for one year's subscription to the AMERICAN CINEMATOCRAPHER, to begin with the issue of , 1 93 1 . Name Address Town State