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UNIVERSITY OF missouri
COLUMBIA
DEPARTMENT OF CHEMISTRY
April 22d, 1932.
Mr. H. H. Barker
APR
United States Radium Corporation
535 Pearl Street
New York City
My dear Barker:
Probably I have written you before
that this year we have a class of 22 students in
Radioactivity. The members of the class are for
the most part graduate students, and we are using
Rutherford's text book; this book contains far
more material than we can master in one semester.
We have been having some members of
the class make reports upon the ionization pro-
duced by single alpha particles and we have again
set up the apparatus for amplifying the ionization
produced by alpha particles, using the so-called
Geiger detector. We are having very good luck with
this experiment.
The more recent experiments in the
Cavendish Laboratory do not make use of the great
amplification produced in the Geiger detector when
an alpha particle enters; instead, the alpha par-
ticle is guided into an ordinary ionization chamber
of small depth and the feeble current thus produced
is amplified through a series of amplifying tubes
until it registers on a single string electrometer
of the Einthoven type. I have two boys who are very
much interested in this matter, simply from a stand-
point of curiosity and desire to experiment. We
could make good use of your Einthoven string electro-
scope; if you do not see in sight for it any good
use in your region of the world, the Chemical Labora-
tory at Columbia would certainly make good use of it.
I understand that Dr. Lind is to be
in the East about April 25th or 26th on his way to
Washington to attend a meeting of the National
Academy of Sciences. I have been invited to attend
a meeting of a sub-committee of the National Research
Council at the same time, but I shall be unable to go.
With very good wishes, I remain,
Sincerely yours,
Herman Schlundt
hs.as
Herman Schlundt.
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"ocrText": "UNIVERSITY OF missouri\nCOLUMBIA\nDEPARTMENT OF CHEMISTRY\nApril 22d, 1932.\nMr. H. H. Barker\nAPR\nUnited States Radium Corporation\n535 Pearl Street\nNew York City\nMy dear Barker:\nProbably I have written you before\nthat this year we have a class of 22 students in\nRadioactivity. The members of the class are for\nthe most part graduate students, and we are using\nRutherford's text book; this book contains far\nmore material than we can master in one semester.\nWe have been having some members of\nthe class make reports upon the ionization pro-\nduced by single alpha particles and we have again\nset up the apparatus for amplifying the ionization\nproduced by alpha particles, using the so-called\nGeiger detector. We are having very good luck with\nthis experiment.\nThe more recent experiments in the\nCavendish Laboratory do not make use of the great\namplification produced in the Geiger detector when\nan alpha particle enters; instead, the alpha par-\nticle is guided into an ordinary ionization chamber\nof small depth and the feeble current thus produced\nis amplified through a series of amplifying tubes\nuntil it registers on a single string electrometer\nof the Einthoven type. I have two boys who are very\nmuch interested in this matter, simply from a stand-\npoint of curiosity and desire to experiment. We\ncould make good use of your Einthoven string electro-\nscope; if you do not see in sight for it any good\nuse in your region of the world, the Chemical Labora-\ntory at Columbia would certainly make good use of it.\nI understand that Dr. Lind is to be\nin the East about April 25th or 26th on his way to\nWashington to attend a meeting of the National\nAcademy of Sciences. I have been invited to attend\na meeting of a sub-committee of the National Research\nCouncil at the same time, but I shall be unable to go.\nWith very good wishes, I remain,\nSincerely yours,\nHerman Schlundt\nhs.as\nHerman Schlundt."
}