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296 E. M. WATSON Vol 43, No. 4
once made the benefits to be derived from any improvements may be more than offset by the disadvantages involved in trying to incorporate them into already finished production. In the war period, when time is at a premium, it is necessary to make decisions quickly and compromise any possible future improvement with the advantage of having what is now on hand available in quantity at an earlier date. It is imperative that what is done in the field of fast motion analysis be completely accomplished in the minimum time while it can still be used.
As contrasted with the difficulties encountered in current development, there is value to be obtained through the studying by many people of regular operation of standard equipment. Since the standard equipment may be used as component parts in many different assemblies, general knowledge of what happens during its regular functioning may facilitate the origination of better methods of employing such equipment by those who are to use it as units in their designs of larger assemblies.
There is now a question of how a fast motion analysis activity may be fitted into an already existing organization. Much depends on finding personnel who may be interested in, and adapted to, doing the kind of work needed. It is noted that with the limited experience up to the present no conclusive answer can be given, but it is believed that in general the purchase of a high-speed motion picture camera for use in the photographic department of an establishment is not the best way to go about it. Instead of making the fast motion analysis activity an appendix to an existing activity of still and ordinary speed motion pictures, the point of view should be more that of a development project, since considerable original thought and pioneer construction are involved in devising and reducing to practical methods the means for best obtaining the different kinds of data needed. Reasons for not just simply adding this activity to the work of the photographic section are mentioned more fully in the following paragraph.
In order to record extremely fast motions adequately and to interpret the data therefrom, it may be necessary to construct special apparatus and to use complicated processes which are as involved as determining the interface distances of crystals from the photographic record made on an X-ray diffraction camera, or the weights of molecules from the photographic record made on a mass spectrograph. Photography may not even be necessary for making records of certain