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March lst, 1933. U.S.Department of Agriculture Food & Drug Administration Washington, D.C. Gentlemen: Attention J.W.Sale Food Control. I have used a Wulf-Hess bifilar gamma ray electroscope for the past ten years and I have found it to be the most sensitive as wll as dependable instrument of this type on the market. I can whole heartedly reconmend the instrument for the type of work for which it is designed. As far as I know the instrument is still manufactured by Gunther and Tegetneyer, GosinescheStrasse 29A Braunshweig Germany, in essentially the same design as the one we loaned to the Public Health Service. We shall be glad to give you any further information we have on this subject which you may desire. Very truly yours, Vice President. H.H.BarkertAf.