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Published online by Cambridge University Press: 14 March 2022
It is evident to every earnest thinker that a theory of time is in a very significant sense implicit in any philosophy of nature. Indeed, the search for a time standard independent of the variation of the earth's speed, the maximum variation being slightly more than one-thousandth of a second, involves the most basic concepts and principles of physical theory (8).
This inquiry was undertaken with the aid of a grant given by the Research Council of Rutgers University. Parts of the paper were read before the Rutgers Mathematics Colloquium, the Fullerton Club at Bryn Mawr College, and the American Philosophical Association at Charlottesville, Virginia, December, 1948.