Haskins, Elmer Ellsworth, 1904-2014-12-152014-12-1519381938b1473283xhttps://archive.org/details/theoryofetherdri00haskhttps://hdl.handle.net/2144/9933Thesis (Ph.D.)--Boston University.en-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.Theory of the ether drift measurement, using a forty-five degree interferometer.Thesis/Dissertation