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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE MAY 1 01929 OFFICE OF INDUSTRIAL HYGIENE WASHINGTON, D. C. AND SANITATION Room 1-123, "C" Bldg. 16 Seventh St. , S. W. May 9, 1929 Mr. H. H. Barker, Vice President, United States Radium Corpn., 535 Pearl st. New York, N. Y. Dear Mr. Barker: The Wulf-Hess electroscope arrived today and ap- pears to be in good condition, We are planning to make some preliminary tests with it on Monday. Please accept our best thanks for your kindness in lending this instru- ment to us. I anticipate it will be of great value to us. Sincerely yours, games E hes (James E. Ives)