
Since I have not been concerned with matters thermo-dynamic for some years, I have hesitated to enter the lists on the recent discussions on “The Speed of Sound and Mach Number Effects,” but I cannot let the comments of Mr. Naylor (Journal, January 1964, p. 63) and the reply by Messrs. Bragg and Smith stand without further comment.I am in agreement with Mr. Naylor in the specific circumstances with which he deals, but I believe his concentration upon the polytropic efficiency obscures the more fundamental approach.
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