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TREASURY DEPARTMENT UNITED STATES PUBLIC HEALTH SERVICE OFFICE OF INDUSTRIAL HYGIENE WASHINGTON, D. C. AND SANITATION APR 23 1929 Room 1-123, "C" Bldg. 16 Seventh St., S. W. April 22, 1929 Mr. H. H. Barker, Vice President, United States Radium Corpn. 535 Pearl St. , New York, N. Y. Dear Mr. Barker: Your letter of April 19th has been received. I am glad to know that the Wulfe bifilar electroscope has arrived in New York. 1 think it will be best for you to ship it directly to this ofiice in Washington, as I want to make some preliminary tests with it before we take it out in the field. I very much appreciate your kindness in plac- ing this instrument at our disposal. Sincerely yours, games E Even (James E. ives)