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TREASURY DEPARTMENT BUREAU OF THE PUBLIC HEALTH SERVICE OFFICE OF INDUSTRIAL HYGIENE WASHINGTON, D. C. AND SANITATION JUN 9 1931 Room 1-123, "C" Bldg. 16 Seventh St., S. W. June 8, 1931 Mr. H. H. Barker, Vice President, United States Radium Corporation, 535 Pearl St. New York, N. Y. Dear Mr. Barker: We are sending you today the gamma ray elec- troscope which you have been so kind as to lend us for our investigation of dial painting. The electroscope has been forwarded by the Railway Express Agency, and I am enclosing the bill-of-lading, I wish to express our appreciation of your kindness in lending us this instrument. It has been of the greatest service to us and if you had not loaned it us to, it would have greatly delayed our study. With best regards, Sincerely yours, games E Eves (James E. Ives) Senior Physicist