Letters Received, February 28, 1933

UNITED STATES DEPARTMENT OF AGRICULTURE FOOD AND DRUG ADMINISTRATION WASHINGTON, D.C. U. S. Radium Corporation, FEB 28 1933 535 Pearl Street, New York, N. Y. Gentlemen: Dr. James F. Ives of the Bureau of the Public Health Service has advised me that through the courtesy of Mr. H. H. Barker, you loaned him a Wulf bifilar electroscope as modified by Hess. The instrument is manufactured by Günther and Tegetmeyer, Braunshweig, Germany. In connection with the enforcement of the Federal food and drugs act, we frequently examine various commercial drug products to determine their content of radioactivity. We are fairly well equipped for this work, but feel the need of a gamma ray electro- scope which has a greater sensitivity than those described in the usual catalogs of chemical apparatus. We think it likely that the Wulf-Hess electroscope would suit our purpose, but we would like to know more about it before we order it. We shall appreciate your advising us of your experience with it, particularly as to whether or not it is a dependable, sensitive instrument and whether it is still being manufactured. If the instrument has been further modified, we would of course want to obtain the latest modification. Very truly yours, fustal 5% W. Sale In Charge, Water & Beverage Section Food Control MAR 1 1933