Letters Received, March 16, 1926

N.C.R.90 PEOFIVED MAR 171923 In reply, address not the signer of NAVY DEPARTMENT this letter but Bureau of Construc- tion and Repair, Navy Department, IO Washington, D.C. BUREAU OF CONSTRUCTION AND REPAIR Refer to No. 1808-A686 (s) 4/1 WASHINGTON, D.C. 161926 Subject: Precautionary Measures Necessary in Connection with the Use of Radium Luminous Material. Gentlemen: A newspaper account which has recently been brought to the Bureau's attention describes certain cases of infection attributed to carelessness in con- nection with the use of radium luminous material for painting dials of watches. This account states that the infection was caused by persons employed in paint- ing watch dials placing the brushes containing radium luminous material in their mouths. The Bureau purchases considerable quantities of similar material, which is used at various Navy Yards for coating dials of clocks and various navigational instruments. As it is desired to avoid serious infections and fatalities such as described in the account referred to, the Bureau would appreciate information as to your experience in this connection and as to any precautionary measures which you have found necessary to avoid such infection. Respectfully appears, Consuruction Corps, 9. G. H. ROCK U. S. Radium Corporation, Asst. Chief of Bureau, 30 Church Street, New York, N.Y.