Letters Sent to Dr. Herman Schlundt, May 8, 1929

May 8th, 1929. Dr. Herman Schlundt, University of Missouri, Columbás Mo. Dear Mr. Schlundt: First allow me to advise you that the calibration of instru- ments Nos. 6 & 7, in the possession of Dr. Flinn have been completed. 7.41 x 10-9 grams of radium produces a fall of 1 dév. por sec. on instrument No. 6 and, 7.31 x 10-9 on No. 7. The Wulf-Hess instrument ordered from Germany some six months ago was delivered to us on Friday of last week. 1 devoted Monday to examination of this instrument et Dr. Flinn's laboratory and, am cure that you will be interested in some of the date obtained. The natural drift of the instrument at this time is about one (1) division in 22 min. The instrument apparently is not quite as sensitive as the one which Dr. Flinn has been using. We find that it requires 1.2 times the amount of radium to produce the same net drift as with the old type of instrument. During this study I took occasion to examine the variation in the rate of drift of the fibers over various pections of the scele and, I find that in both instru- ments the rate of foll of fillers decreases a.g the fibers approach zero. This condition seems to hold for the new instrument as woll as the old and apparently in about the same ratio. Under these conditions the instruments appear to be more sensitive at a fairly high range on the soale, which would indicate that it is better to follow the prectice that we have rather than that suggested by Dr. Fialla - namely, reading on lower sections of the scale. I have today forwarded the new instrument to Dr. Ives and, trust that he will receive same in first class condition. An instrument with auch a s.low netural drift has some disad- vantages, namely - in the time required for making observations it is quite possible that it will be necessary for them to overcome this objectione by utiliz- ing a given amount of radium in a fixed position to accelerate the natural drift. Dr. Flinn seens to be continuing his studies upon this entire subject and, has at the present time two girls from Waterbury confined at a private hospital here in N.Y.C. He is conducting a series of experiments in conjunction with an M.D., to determine whether or not the rate of elimination may be increased and, while he did not divulge his method of treatment he did state that he was meeting with success. I questioned him relative to his measurements and he stated that at the present time they consisted of alpha ray comparison only, but that he expected to make emination determinations. He advised that he hopes to do this himself, utilizing the by-sulphate fusion method. I personally feel that Dr. Flinn is making a mistake by attempting this work with his limited experience in this field, but apparently he does not propose to share any future honors in