Abstract
E. A. Milne, whose two logarithmically related t and τ scales of time were mentioned in Chapter One, Section C, has attempted to erect the usual space-time structure of the STR on the basis of a light signal kinematics of particle observers purportedly dispensing with the use of rigid solids and isochronous material clocks.1 In his Modern Cosmology and the Christian Idea of God,2 Milne begins his discussion of time and space by incorrectly charging Einstein with failure to realize that the concept of a rigid body as a body whose rest length is invariant under transport contains a conventional ingredient just as much as does the concept of metrical simultaneity at a distance.3 Milne then proposes to improve upon a rigid body criterion of spatial congruence by proceeding in the manner of radar ranging and using instead the round-trip times required by light to traverse the corresponding closed paths, these times not being measured by material clocks but, in outline, as follows.4 Each particle is equipped with a device for ordering the genidentical events belonging to it temporally in a linear Cantorean continuum. Such a device is called a “clock,” and the single observer at the particle using such a local clock is called a “particle-observer.”
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Notes
L. L. Whyte: “Light Signal Kinematics,” British Journal for the Philosophy of Science, Vol. IV (1953), pp. 160–61.
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© 1973 D. Reidel Publishing Company, Dordrecht, Holland
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Grünbaum, A. (1973). Philosophical Appraisal of E. A. Milne’s Alternative to Einstein’s STR. In: Philosophical Problems of Space and Time. Boston Studies in the Philosophy of Science, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2622-2_13
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DOI: https://doi.org/10.1007/978-94-010-2622-2_13
Publisher Name: Springer, Dordrecht
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