1. F. R. Tangherlini:Am. Journ. Phys.,36, 1001 (1968).
2. The earliest reference to a recognition of this logical alternative that we have been able to locate, so far, is T. Preston:The Theory of Light (London, 1895). A more recent reference isW. C. Michels, M. Correl andA. L. Patterson:Foundations of Physics (Englewood Cliffs, N. J., 1968). But note these authors do not treat refraction as a conservative process, as we do. A clear discussion of the logical foundations of the Foucault experiment is given byP. Frank:Philosophy of Science (Englewood Cliffs, N. J., 1957).
3. F. R. Tangherlini:Lett. Nuovo Cimento,2, 293 (1969);3, 88 (1970).
4. F. R. Tangherlini:Nuovo Cimento,25, 1081 (1962). For comments seeW. M. Sachs andJ. A. Ball:Am. Journ. Phys.,36, 240 (1968);W. Rindler:Am. Journ. Phys.,37, 72 (1969);F. R. Tangherlini:Am. Journ. Phys.,37, 1286 (1969).
5. See,e.g.,H. Yilmaz:Phys. Rev.,111, 1417 (1958);R. H. Dicke:Evidence for Gravitational Theories, edited byC. Møller (New York, 1962), p. 13.