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By P. W Bridgman

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The apparent length of a stick in space depends on its orientation with respect to us. It can be oriented transversally and show us a maximum extension, and it can be oriented radially and show us only its thickness. In a space–time, time is a coordinate together with the space coordinates. We should expect us to be forced to distinguish apparent time intervals measured by a distant observer from time intervals measured in the observed object itself. , on the relative velocity of the object. Newtonian mechanics does not contain such an effect.

Dierck-E. Liebscher Copyright © 2005 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim ISBN: 3-527-40567-4 22 3 Reflection and Collision obtain an impression how to represent motions. After this is done, we can look for abstract definitions. 2 This is important for our purposes, because we can easily construct mechanical realizations of reflections and because the totality of reflections is simpler than that of rotations in this respect. Nevertheless, the reflection on a line (in space on a plane) is not a motion composed of translations and rotations.

Contrary to the expectation to find isotropy in one frame of reference only, we see isotropy in any frame of reference. We may suppose the existence of a medium, the aether, but it remains imperceptible. 11 The velocity of light combined with other velocities always yields the speed of light. The speed of light is not changed in combination with the relative velocities of observers. This expresses the lack of any aether for the mediation of light propagation. However, this alone does not save the relativity principle.

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