Letters Sent to C.B. Lee, April 20, 1929

COPY. SK:HD. April 20th, 1929 Mr. C. B. Lee, President, United States Radium Corporation, 535 Pearl Street, New York, N. Y. My dear Mr. Lee: During one of our conversations you promised to advise me of the radium contents in the various amounts of luminous composition used by your customers, when I sent you the list of these. It seems hardly necessary to send you a detailed list of amounts for computation, so I am just inclosing a list of the various grades, as furnished by the firms, and should appreciate it if you will give me the e lemental contents per gram for them, as manufactured before 1925. I am giving this date because I understand that changes in contents have been made since then, and I do not want to inquire too closely into private business. But, anyway, I want to assure you that the information will be kept strictly confidential, and that the only figures published will be the radium contents of monthly amounts used by establishment No. 1, 2, etc. , so that it can not be identified. Thanking you in advance, and with best personal regards, Sincerely yours, S. Kjaer. . Repr. U. S. Bureau of Labor Statistics.