Letters Sent to Dr. Herman Schlundt, May 15, 1930

May 15th,1930. Dr. Herman Schlundt, Univessity of Missouri, Columbia, Mo. Dear Dr. Schlundt: A conference is being held today at New Haven,Conn. with the New Haven Clock Col, Waterbury Clock Co., the E. Ingraham Co., and the U.S. Department of Health and Dr. Flinn present, to discuss the matter of activity which has been found amongst various employees engaged in the application of luminous mater 61 to wateh and clock diels. lie gather from Dr. Flinn that Mr. Knowles, the physicist who has been making the radioactive tests upon the employees engaged in the application of luminous materials to watch dials, that he has found a number of people active, whom Dr. Flinn has not noted any activity in. Ifurther gather from some of the Clock Companies that they were not any to well impressed by some of the representatives sent to their respective plents by the Dept. of Public Pealth, and that in case the Dept. of Public Heslth is inclined to report girls active who hitherto have not been reported active by Dr. Flinn they are going to object. The object of this conference primarily is to adjust any difference that may exist so that the Dept. of Health will render a report which will be satisfactory to the various companies involved. The instrument with which Nr. Knowles has been working has a natural drift about 1/4 that which Dr. Flinn has, and as I recall it is slightly more sensitive. As you realize Dr. Flinn and Mr.Knowles may both be classed as more or less novices in the art of radioactive measurements, and while I have a good deal of regard for the ability of both, still 1 also realize that their lack of experience is a handicap. Mr. Anowles seems to think that he can detect_much smaller quantities of radium in the human being than Dr. Flinn, whose instrument's drift is so much higher - the respective drifts are about as follows: Dr. Flinn's instrument 0.0032 div. per sec, Mr. Knowles instrument 0.0009 div. per sec. As Dr. Fialla advised you Mr. knowles and he were going to callibrate the instrument which Mr. knowles is working with, by placing enanation seeds in a cadavar and making readings. This work has been completed, and while I do not have the final results obtained, still Dr. mada did indicate to me the constant which ve have been using is considerably too low. I gathered this from his statement that according