The purpose of this article is to introduce a substantial short cut in finding the wind flow in an isentropic surface. This is done by utilizing the fact that, at a given level in the isentropic surface, the acceleration potential is uniquely determined by the pressure. From new tables of values for every 5000 feet, values for any level can be quickly obtained by easy interpolation.

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*Presented at the Cambridge [joint M. I. T.—Harvard—A. M. S.] Seminar on May 12, 1942.