Journal of the Society of Motion Picture Engineers (1930-1949)

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FRAME NO, CRANK AN6LE 7 8 mmm^ r* L*% m %if m S t s »20 IDC 20 48 CRANK ANGLE DEGRESS 100 Fig. 11. Flame pictures and corresponding pressure card of preigniting explosion; engine speed 900 rpm; throttle fully open; spark advance 16 deg before top dead center; air-fuel ratio 13:1; compression ratio 6.8 : 1; 70-octane number reference fuel. could be correlated readily. Figure 11 illustrates the type of record obtained by this process. This engine and photographic procedure is being used at the present time as a tool in the continuing research on our modern automobile engine. References 1. L. L. Withrow, and T. A. Boyd, "Photographic flame studies in the gasoline engine," Ind. Eng. Chem., 23: 539-547, May 1931. 2. E. B. Wedmore, "A novel high-speed camera," J. Sci. Instr., 4: 345-347, 1927. 3. A. R. Greenleaf, Photographic Optics, Macmillan, New York, 1950, pp. 4950. 4. G. M. Rassweiler, and L. L. Withrow, "Motion pictures of engine flames correlated with pressure cards," SAE Jour. (Trans. \ 42: 185-204, May 1938. 5. F. E. Tuttle, "A non-intermittent highspeed 16mm camera," Jour. SMPE, 21: 474-477, Dec. 1933. 6. J. L. Boon, "The Eastman high-speed camera, Type III," Jour. SMPE, 43: 321-326, Nov. 1944. 484 December 1952 Journal of the SMPTE Vol. 59