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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE OFFICE OF MAR 15 1929 INDUSTRIAL HYGIENE WASHINGTON, D.C. AND SANITATION Room 1-123, "C" Bldg. 16 Seventh St. , S. W. March 13, 1929 Mr. H. H. Barker, United States Radium Corpn. 535 Pearl St., New York, N. Y. Dear Mr. Barker: Your letter of yesterday's date received. We shall be very glad to make use of the Wulf-Hess electrom- eter just as soon as it arrives, and, accepting your very kind offer would ask you to forward it to us as soon as you receive it. We certainly appreciate your kindness and courtesy in placing the instrument at our disposal. Yours sincerely, games E here (James E. Ives)