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This diminished simplicity would be due to the fact that the

carriage K would be in motion (i.e. "really")with respect to K0.

In the general laws of nature which have been formulated with

reference to K, the magnitude and direction of the velocity of

the carriage would necessarily play a part. We should expect, for

instance, that the note emitted by an organpipe placed with its

axis parallel to the direction of travel would be different from

that emitted if the axis of the pipe were placed perpendicular to

this direction.