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That classical physics can be easily extended to produce results originally derived by Einstein's general theory of relativity, but with ordinary concepts of space and time, s shown in this concise paper written by Theodore Theodorsen, the head theorist at N.A.C.A. (forerunner of NASA) in the heady days when aeronautics evolved from a very primitive art into a full-fledged science. A physicisit, and long-time skeptic about Einstein's theory, he sought and developed explanations to replace those involving curved spacetime and abstract mathematical fields. In essence, Newtonian theory is modified by only a "quantum" change to yield Einstein's results. We are very grateful to Muriel T. Williams for presenting us with her father's manuscript.