D O C U M E N T 4 6 1 J A N U A R Y 1 9 2 7 7 2 3 461. From George E. Hale [Mount Wilson,] January 21, 1927 Dear Professor Einstein: I am deeply obliged to you for your very kind letter, which has been of great interest to Millikan and me, and will also be shown to Adams, Seares, and oth- ers interested in the questions you discuss. A copy will be sent to Dr. Baade, who has recently left the Observatory. Millikan says that Professor Swaan of Yale University has been trying to develop similar initial conceptions regarding magne- tism, but does not know whether he has made any progress. We fully agree with you in thinking that no other explanation of terrestrial or solar magnetism is of any value, and therefore greatly hope that you will see a way to continue your investi- gations. Professor and Mrs. Lorentz are here, in excellent health, and I hope very soon to have an opportunity to discuss your letter with him. Professor Michelson is also here, and is nearly ready to repeat the Michelson-Morley experiment. Believe me, with kindest regards and repeated thanks, Yours very sincerely, TLC (CaPsCA). [90 227]. Addressed “Professor Dr. A. Einstein University of Berlin Berlin, Ger- many.” Doc. 437. Robert A. Millikan. Walter S. Adams (1876–1956) was director of Mount Wilson Observatory. Frederick H. Seares. Walter Baade. William F. G. Swann (1884–1962) was Professor of Physics at Yale University. See, e.g., Swann 1926. H. A. Lorentz and Aletta Lorentz-Kaiser (1858–1931). Albert Michelson.