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September 11,1928. Dr. R. B. Moore, Dean of Science, Purdue University, School of Science, Lafayette, Ind. Denr Dr. Moore: We are herewith enclosing our check for your services and expenses in connection with your trip to Berlin to investigate any possible deleterious affects that may have been reported from those engaged in the application of luminous material. We shall be interested to know whether you hear anything further from the gentleman who advised you that he would be glad to look into the matter as to whether or not the applicators used brushes in their work. For the present I believe thiss will satisfy us regarding the data available abroad at this time. Sincerely yours, Vice President. HHBarker :RH