Manuscript and illustrations for this volume were prepared for Publication by the Summary Reports Group of the Columbia University Division of War Research under contract OEMsr-1131 with the Office of Scientific Research and Development. This report was printed and bound by the Columbia University Press and was also issued as Volume 3 of Division 6 in the series of Summary Technical Reports of the National Defense Research Committee. It was originally published in duplicate form on 10 April, 1946, and was given wide distribution within the Navy Department. Distribution of this volume has been made by the Chief of Naval Operations. Inquiries concerning the availability and distribution of this report and microfilmed and other reference material should be addressed to the office of the Chief of Naval Operations, Navy Department, Washington 25, D.C.

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