2 8 4 D O C U M E N T 1 5 7 J A N U A R Y 1 9 2 6 [2]See Doc. 13 for Einstein’s comments to the journal Science on the results of Dayton C. Miller’s ether drift experiments. [3]See Michelson and Gale 1925, in which a ring interferometer is used to measure the rotation of the Earth. [4]See Sagnac 1913 for the first experiment with a ring interferometer to report the Sagnac effect.The Sagnac effect invalidates the hypothesis of ether drag and was Miller’s preferred explana- tion of his own results (because, if the Earth indeed were to drag the ether along with it, it should be impossible to detect the Earth’s rotation). [5]Émile Meyerson. [6]See Doc. 9.