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335. Welding. Final report on evaluation of weldability by direct measurement of cooling rates, measurement of cooling rates associated with are welding and their application to selection of optimum welding conditions (OD-37-1) [with list of references]; by W. F. Hess, L. L. Merrill, E. F. Nippes, jr., A. P. Bunk.

340. Odographs. Report on trip to England, Nov. 12, 1942-Feb. 1, 1943, including demonstration of odograph, British aircraft compasses, British vehicular compasses, British dead-reckoning devices, and British marine logs (under contract NDCro-187); by Bryant Tuckerman.