Ehrenfest's Paradox

ATWATER'S remarks 1,2 on the relativistic rotating disk problem (Ehrenfest's paradox 3 ) have elicited considerable response 4–6 of a somewhat peripheral nature. Atwater concludes that recourse to experiment is highly desirable. Arzelies 7 , while questioning the existence of relativistic constraints, also agrees with this view. The purpose of this communication is to point out what one might expect to observe as a disk rotates and to develop the magnitude in a practical case.