%0 Journal Article
%T One-Way Speed of Light Measurements without Clock Synchronisation
%A Cahill R. T.
%J Progress in Physics
%D 2012
%I HEXIS (Arizona)
%X The 1991 DeWitte double one-way 1st order in v=c experiment successfully measured the anisotropy of the speed of light using clocks at each end of the RF coaxial cables. However Spavieri et al., Physics Letters A (2012), have reported that (i) clock e ects caused by clock transport should be included, and (ii) that this additional e ect cancels the one-way light speed timing e ect, implying that one-way light speed experiments ˇ°do not actually lead to the measurement of the one-way speed of light or determination of the absolute velocity of the preferred frameˇ±. Here we explain that the Spavieri et al. derivation makes an assumption that is not always valid: that the propagation is subject to the usual Fresnel drag e ect, which is not the case for RF coaxial cables. As well DeWitte did take account of the clock transport e ect. The Spavieri et al. paper has prompted a clari cation of these issues.
%K DeWitte double one-wayexperiment
%K anisotropy of the speed of light
%K clock transport. Fresnel drag e ect
%U http://www.ptep-online.com/index_files/2012/PP-30-08.PDF