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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
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"ocrText": "May 8th, 1929.\nDr. Herman Schlundt,\nUniversity of Missouri,\nColumbás Mo.\nDear Mr. Schlundt:\nFirst allow me to advise you that the calibration of instru-\nments Nos. 6 & 7, in the possession of Dr. Flinn have been completed. 7.41 x\n10-9 grams of radium produces a fall of 1 dév. por sec. on instrument No. 6 and,\n7.31 x 10-9 on No. 7.\nThe Wulf-Hess instrument ordered from Germany some six months\nago was delivered to us on Friday of last week. 1 devoted Monday to examination\nof this instrument et Dr. Flinn's laboratory and, am cure that you will be\ninterested in some of the date obtained.\nThe natural drift of the instrument at this time is about one\n(1) division in 22 min.\nThe instrument apparently is not quite as sensitive as\nthe one which Dr. Flinn has been using. We find that it requires 1.2 times the\namount of radium to produce the same net drift as with the old type of instrument.\nDuring this study I took occasion to examine the variation in the rate of drift\nof the fibers over various pections of the scele and, I find that in both instru-\nments the rate of foll of fillers decreases a.g the fibers approach zero. This\ncondition seems to hold for the new instrument as woll as the old and apparently\nin about the same ratio. Under these conditions the instruments appear to be\nmore sensitive at a fairly high range on the soale, which would indicate that it\nis better to follow the prectice that we have rather than that suggested by\nDr. Fialla - namely, reading on lower sections of the scale.\nI have today forwarded the new instrument to Dr. Ives and,\ntrust that he will receive same in first class condition.\nAn instrument with auch a s.low netural drift has some disad-\nvantages, namely - in the time required for making observations it is quite\npossible that it will be necessary for them to overcome this objectione by utiliz-\ning a given amount of radium in a fixed position to accelerate the natural drift.\nDr. Flinn seens to be continuing his studies upon this entire\nsubject and, has at the present time two girls from Waterbury confined at a private\nhospital here in N.Y.C. He is conducting a series of experiments in conjunction\nwith an M.D., to determine whether or not the rate of elimination may be increased\nand, while he did not divulge his method of treatment he did state that he was\nmeeting with success. I questioned him relative to his measurements and he stated\nthat at the present time they consisted of alpha ray comparison only, but that he\nexpected to make emination determinations. He advised that he hopes to do this\nhimself, utilizing the by-sulphate fusion method.\nI personally feel that\nDr. Flinn is making a mistake by attempting this work with his limited experience\nin this field, but apparently he does not propose to share any future honors in"
}