Letters Received to Dr. Henry F. Stoll, December 6, 1928

ESTABLISHED 1824 THE E. o INGRAHAM COMPANY MANUFACTURERS OF CLOCKS AND WATCHES BRISTOL, CONN. U.S.A. December 6th, 1928. Dr. Henry F. Stoll, 179 Allyn Street, Hartford, Conn. Dear Dr. Stoll:= The writer had a talk yesterday wil th Messrs. Lee and Barber of the United States Radium Corp. who have had a great deal of experience with radium poisoning. I read them the statement from your letter that "it is the radium laden air that is inhaled rather than the small amount on the brush that causes the trouble". They feel certain that this does not maintain where the application is done by brush. They state that radium is free emanating and produces a gas known as radon, but that when radium is combined with a gas absorbing material, such as zine sulphite which is used in the production of radium luminous paint, the percentage of gas thrown off is so infinitestinal that it is impossible to become affected by it. They do state that if dials were dusted it would be possible for the air to become dust laden, in which case the material could be taken in through the air. They also advise that there has never yet been a case of illness from radium poisoning where the presence of radium could not be proven by the electroscope test and that all serious cases had revealed at least 60 to 100 micrograms. Furthermore the electroscope will detect as small as two micrograms and no positive action at all has been found in the electroscope test on the girls employed by us, or on Miss Dube in particular. As a matter WE SELL THE WHOLESALE TRADE ONLY