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ROTATING-PRISM CAMERA 501
to withstand the centrifugal forces that are present when the prism is rotating and the prism must be mounted in such a way and with small tolerances that the effects of vibration are eliminated. This calls for bearings of extreme precision as well as precision-cut driving gears.
In order to obtain satisfactory results with any rotating-prism camera, it is necessary that the prism faces as well as the lens be kept clean.
The data as presented above indicate that high-quality, high-speed rotating-prism cameras are possible which will approximate the quality obtained with an intermittent-type motion picture camera. The use of prism glasses of high index of refraction and low dispersion with minimum thickness and minimum angle of incidence, in conjunction with suitably designed components such as lenses, sprockets, bearings, and so forth, produce these results.
BIBLIOGRAPHY
(1) J. Kudar, "Optical problems of the image formation in high-speed motion picture cameras," J. Soc. Mot. Pict. Eng., vol. 47, pp. 400-403; November, 1946.
(2) F. E. Tuttle, "A non-intermittent high-speed 16 mm camera," J. Soc. Mot. Pict. Eng., vol. 21, pp. 474-478; December, 1933.
(3) J. L. Boon, "The Eastman high-speed camera Type III," J. Soc. Mot. Pict. Eng., vol. 43, pp. 321-327; November, 1944.
(4) W. Herriott, "High-speed motion picture photography applied to design of telephone apparatus," J. Soc. Mot. Pict. Eng., vol. 30, pp. 30-36; January, 1938.
(5) Howard J. Smith, "8000 pictures per second, /. Soc. Mot. Pict. Eng., vol. 45, pp. 171-184; September, 1945.
(6) John H. Waddell, "Wide angle 35-mm high-speed motion picture camera," /. Soc. Mot. Pict. Eng., vol. 46, pp. 87-102; February, 1946.
(7) J. F. Leventhal, "A new optical compensator," Trans. Soc. Mot. Pict. Eng., vol. 12, no. 36, pp. 1068-1075; 1928.
(8) F. Tuttle and C. D. Reid, "The problem of motion picture projection from one continuously moving film," /. Soc. Mot. Pict. Eng., vol. 20, pp. 3-31; January, 1933.
(9) H. D. Taylor, "The image distortion and other effects due to glass thicknesses in lens systems," Proc. Phys. Soc., vol. 46, pp. 283-291; 1934.
(10) H. D. Taylor, "Image distortion due to glass thickness lens systems, Part II," Proc. Phys. Soc., vol. 46, pp. 889-896, 1934.
(11) H. D. Taylor, "Image distortion on the use of rotating parallel plate glass blocks for cinematography and for projection of continuous moving films," Proc. Phys. Soc., vol. 49, pp. 663-670; 1937.
(12) J. Kudar, "Optical problems of the rotating prism cinematograph projector," Proc. Phys. Soc., vol. 58, pp. 598-605; 1946.