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Report of the Progress Committee 89
scribed an apparatus for photographing sound studies of buildings. General instructions have been prepared on the use of the motion picture camera for recording data from various measuring instruments.^^^ Hausler^^* has published comprehensive papers on the use of cinematography for making rapid general geographical surveys.
The recording of stress patterns in glass and celluloid by polarized light has been accomplished with motion pictures. ^*^^ RusselP^^ has made a beautiful time-lapse study of the rotation of the planet, Jupiter.
Motion pictures at one second intervals showed that the rate of fall of a dummy thrown from an airplane remained at 120 miles per hour throughout the entire fall.^^^ A camera using 16 mm. film has been devised for photographing the checks handled each day by a bank.2^^
V. Color Cinematography
There have been no outstanding advances recorded in the field of professional color motion pictures. Lehmann and Kofes^®^ in a long general article have reviewed the possibilities of two-color additive and subtractive methods and have concluded that a two-color subtractive process is in general the more satisfactory. The method of manufacture of Lignose color screen film has been described by Emmermann.^^^ Patents related to three-color cinematography^^^ are in general concerned with methods of making multi-color screens, successive exposure through primary filters, and exposing through prisms to produce three images on the area normally occupied by one picture.
A short description has been published of the working principles of the Kellar-Dorian process which uses film on the support side of which horizontal cylindrical lenses of 1/60 mm. diameter are embossed. ^^^ Exposure is made through a three-color diaphragm, the film being threaded in the camera with the emulsion side away from the lens. Patent protection has been granted for a number of improvements in processes using embossed films. ^^^
Bourquin"* has given description of the WolfP-Heide two-color additive process. Pictures are taken with an ordinary motion picture camera at 28 frames per second, using film which has alternate frames sensitive to red and blue, respectively. Alternate frames of the print are dyed and the film projected at 24 frames per second.