Letters Received to H.H. Barker, April 22, 1932

UNIVERSITY OF MISSOURI COLUMBIA DEPARTMENT OF CHEMISTRY April 22d, 1932. Mr. H. H. Barker 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 Radioastivity. 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 8. 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 Schilundt hs.as Herman Schlundt.