Page:WitteSagnac1.djvu/4

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directed aether wind (vent relatif de l’éther) of same absolute amount

1)

of relative aether velocity.

The imagined rotation of the system shall happen counter-clockwise ()

thus the relative aether circulates clockwise () in relation to the system imagined as being at rest.

Of the two light rays denoted by and , which are circulating clockwise and counter-clockwise, one (namely ray ) at first travels faster away from , then in the same measure faster around the whole circle, and also faster back to point ; the other one, , is held back in the same way. –

When any wave is transmitted faster or held back by a relative stream of the wave-carrying medium, then it's known that (in first approximation), the time of earliness or delay is defined – with respect to normal time employed at standard velocity – by

,

in case the directions of and coincide or are precisely opposite; instead of time one can also introduce the (apparent) path-contraction or -elongations , then is defined – with respect to the normal path ("real" path) – by