Letters Received to H.H. Barker, April 15, 1930

UNIVERSITY OF MISSOURI COLUMBIA DEPARTMENT OF CHEMISTRY April 15, 1930 Dr. H. H. Barker United States Radium Corp. 535 Pearl Street New York City, N. Y. My dear Howard: Please extend my greetings to President Lee. I am sorry that his trip did not produce a richer find of Radium ore. I I suspect that some of these Western prospectors and their friends have conceived the idea that a mineral which has a black luster resembling that of pitchblend must be legitimate material for promoting the sale of Radium claims. Mr. Lee will have to do some more prospecting in order to re-open the Radium extraction business here in America. We are very much obliged to you for the sample of phosphorescent zinc sulphide that has come to us today. Perhaps within the next two or three weeks we will be able to render you a report on some experiments on this which Mr. Wahl has carried out in the preparation of phosphorescent zinc sulphide. By the way the Department of Physics here has a Macbeth instrument for making comparisons on the luminosity of specimens. Yours very truly, Herman Sohlund Herman Schlundt. HS gma