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" ... Miller repeated what was essentially the Michaelson-Morley experiment at the Mount Wilson laboratory, but with probably the most sensitive interferometer in the world at that time. He found that his interference pattern changed sinusoidally as the apparatus was rotated: that is, it provided evidence for a relative variability of light speed and a contradiction of one of Einstein’s fundamental postulates. It was a very small effect, which forced Miller to hypothesize that the ether was being “carried along” by the earth to a large extent, but he was sure it was there. ... "