HH tH ae an] i tp FOREWORD The sequence of test shots the stage of thinking of set forth herein represents the Laboratory as of 4 November 1947, and should not be interpreted as a Laboratory recommendation at this time. Definite recommendations must await the results of tests now in progress and which should be complete before 1 December 1947. It should be noted that the members of the Laboratory are in good agreement if the first two models tested prove .successful, but diversity of opinion exists if the first two are unsuccessful. This arises from the different emphasis that persons put upon the aims of the test program. {i>

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