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

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Oct., 1944 FAST MOTION ANALYSIS 290 accomplished, and it appears for the present there is little prospect of its being done. In order to make the most progress in the development of apparatus, things to be done should include not only the obvious items but also those where the method of doing them can be found only by many trials, or may not even be possible until some subsequent development or invention provides the methods or material needed. Briefly, this means that not only the easy but the difficult things should be tried. Failure to get results by fast motion analysis may come from a number of things such as the fact that (1) methods used in the analysis are not suitable for the kind of investigation at hand, (2} conditions believed to be present are found to be nonexistent, and the discrepancy is due to some other cause, and (3) con FIG. 7. 50-Caliber gun with window cut in side for viewing operation. ditions are found to exist for which no remedy can be immediately devised. High-speed pictures are best when the undesired motions looked for are fairly large and take up more than 5 per cent of the diameter of the picture area. There is considerable leeway, as there is a wide choice of picture area. In general, this method of analysis is best for reciprocating motions, where motions of parts are irregular and do not follow any well-defined path, or where articles are grasped, transported and released. With reference to the analysis of fast motions, we find not only a problem in the technique of obtaining data but also a problem in the psychology of the minds of the people who are to use it. The latter perhaps is the more important, because it involves individuals as separate units, whereas technique once developed is usually universally applicable. People vary in their background of experience and reaction to ideas. Getting various people together in a discussion