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Fig. 9. 16mm frame showing the flywheel at the right and the fluorescent window frame.
fore, the top of the window frame was painted with blue fluorescent sign paint and illuminated with ultraviolet light from three General Electric 100-w E-H4 projector flood lamps operated on direct current using filters similar to Corning filter color specification 739 which confined most of the illumination to ultraviolet wavelengths. This method gave sufficient visible light from the window frame but did not affect the pictures of the combustion process.
The third major change from previous operating procedure was the use of Eastman Kodak Linagraph Pan 16mm film in place of Eastman Kodak Super XX film. This was done because of the exceptional blue sensitivity of this new film and the predominance of blue light given off by the combustion process allowing shorter exposure times to be used.
The fourth and perhaps most important change in procedure was the method used to determine the angular position of the crankshaft at which each picture was taken. This was done by replacing the //2.7, 63-mm focal-length lens with which the camera was equipped with an //1. 9, 25-mm focal-length lens. The shorter focal-length lens provided a sufficiently great depth of focus so that when the combustion chamber of the engine was in focus the flywheel of the engine which was about seven inches further from the camera than the combustion chamber remained well enough in focus so that the degree divisions on the flywheel could readily be seen. Even though the shorter focal-length lens reduced definition, the photographs were sufficient for this study. The rim of the flywheel was painted a dull black and the degree divisions and numbers white. At frame speeds of 2000 frame/
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December 1952 Journal of the SMPTE Vol. 59