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Here the Fitzgerald-Lorentz contraction is a real dynamical effect of absolute motion, unlike the Einstein spacetime view that it is merely a spacetime perspective artifact, and whose magnitude depends on the choice of observer.
The relativistic Fitzgerald-Lorentz contraction effect causes the arm AB parallel to the absolute velocity to be physically contracted to length
where [k.sup.2] [approximately equal to]n([n.sup.2] - 1), while neglect of the Fitzgerald-Lorentz contraction effect gives [k.sup.2] [approximately equal to] [n.sup.3] [approximately equal to] 1 for gases, which is essentially the Newtonian calibration that Michelson used.