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Feb., 1930] PROGRESS REPORT 245
photographic study of gaseous explosions, using an ultra-rapid chronophotographic apparatus which exposes 200 meters of film per second.211 A camera equipped with a lens which refracts the light rays into a cone of about 90 degrees has been devised for taking pictures of lightning. A wide angle lens system is placed behind the front or "fish eye" lens to project the rays on the film.212
V. COLOR CINEMATOGRAPHY
The most extensive production program of color motion pictures during the history of cinematography was launched during the summer of 1929. The bulk of the pictures made thus far and planned for are by the Technicolor process and most of them are to be allsound pictures. Expansion plans are announced by this company which will give them eight times their present capacity early next year.213 Two producing units are to be built in New York and their Boston and Hollywood laboratories are to be expanded so the former will be fitted with five units and the latter with three units. The announcement also states that the present two-color subtractive process is to be displaced by a three-color process of similar basic principles. It is reported that Technicolor has developed a method whereby the sound track can be a black and white silver image whereas the picture area is composed of dyes.
Brown214 has described some of the problems encountered in making the all-color (Technicolor), all-sound picture, Under a Texas Moon during the summer of 1929. The difficulty of making exterior shots by a two-color process is well known and great care was used in choosing the location so that the rock formations and vegetation would be of suitable color for good reproduction. To overcome the color changes resulting from light variations, portable incandescent lamps were used. These were focussed on cloth reflectors to minimize the heat. Special booths had to be utilized for the color cameras as they make more noise than black and white cameras.
Tietze215 has written on the use of the Busch two-color additive process for photographing surgical operations. This process uses a twin lens camera and projector with filters over the lenses. The two images of the positive are superposed on the screen. Patents216 dealing with three-color additive processes are related to the preparation and use of various types of multi-color screens, a three filament lamp with a condensing system, and a method of reducing the image size so that three pictures may occupy one frame.