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March 12th, 1929. Dr. James E. Ives, United States Public Health Service, Room 1-123, "C" Bldg., 16th Seventh St., S.W. Washington, D.C. Dear Dr. Ives: With further reference to my letter of March lst, please be advised that Gunther & Tegatmeyer cabled us to the effect that the Wulf-Hess electrometer would be shipped from Brunschweig, Germany on March 15th, which means that it will ppobably be in our possession around April 15th. We shall be glad to place this instrument at your service immediately upon its arrival, if that will not be too late. Very truly yours, Vice Prosident. HHBarker:RI