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Note on page No 481 * “On the Vortex Theory of Screw Propellers.” S. Goldstein. Proc. Roy. Soc. A., Vol 123, 1929.
Note on page No 484 * “The Equilibrium of Loaded Impeller Blades, with special reference to the Strength of Thin Metal Airscrews.” By the late P. A. Ralli. Journal R.Ae.S., February, 1931.