Extracted text

OCR Page 1 of 2
350 Main Street, Ornnge, N. J. November 11, 1925. Dr. F. B. Flinn, 437 West 59th Street, Columbia University, New York City. Dear Dr. Flinn:- The sample of activitated zinc sulphide subnitted by you for analysis cont ains 0.0549 milligrans of radium element or its equivalent when mensured by its gomm radiation. This figures the same na material which contains 2.90 no of radium element or its equivalent per 100 grans. Very truly yours, H. H. Barker.