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Letters Received to H.H. Barker, February 17, 1936

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EFB 20 1936 MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF PHYSICS CAMBRIDGE, MASS. Feb. 17, 1936 Mr. H. H. Barker, Vice-President U. S. Radium Corporation 535 Pearl Street New York, N. Y. Dear Mr. Barker: In connection with your recent correspondence with Mr. A. W. Anthony, Jr., of Cambridge, the attached sketch will indicate what sort of radioactive device is contemplated. A small glass capsule filled with air at atmospheric pressure and provided with two electrodes is to contain sufficient active material to maintain a saturation current of about x rad19.-9 amperes. None of the construction details are critical, the only requirement being the limiting saturation current. Will you let me know whether you could make such a device and at approximately what cost? Very truly yours, Robley Becam Robley D. Evans Asst. Professor of Physics RDE: T Enc.

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