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

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EEB 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 radio- active material to maintain a saturation current of about 2 X 10-9 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 Devans. Robley D. Evans Asst. Professor of Physics RDE:T Enc. MASSACHUSETTS INSTITUTE OF TECHNOLOGY FEB 80 1936 DEPARTMENT OF PHYSICS CAMBRIDGE, MASS. Ra or moth on innerwall. nickel electrodes. cm air at pyrexglaso /atm. ca3cm - approximate characteristics - I $ 2x109 amperes. ca 100 volts R.D. Evans

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3
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184ebb2447de741e
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    "ocrText": "EEB 20 1936\nMASSACHUSETTS INSTITUTE OF TECHNOLOGY\nDEPARTMENT OF PHYSICS\nCAMBRIDGE, MASS.\nFeb. 17, 1936\nMr. H. H. Barker, Vice-President\nU. S. Radium Corporation\n535 Pearl Street\nNew York, N. Y.\nDear Mr. Barker:\nIn connection with your recent correspondence\nwith Mr. A. W. Anthony, Jr., of Cambridge, the attached sketch\nwill indicate what sort of radioactive device is contemplated.\nA small glass capsule filled with air at atmospheric pressure\nand provided with two electrodes is to contain sufficient radio-\nactive material to maintain a saturation current of about 2 X 10-9\namperes. None of the construction details are critical, the\nonly requirement being the limiting saturation current.\nWill you let me know whether you could make\nsuch a device and at approximately what cost?\nVery truly yours,\nRobley Devans.\nRobley D. Evans\nAsst. Professor of Physics\nRDE:T\nEnc.\nMASSACHUSETTS INSTITUTE OF TECHNOLOGY\nFEB 80 1936\nDEPARTMENT OF PHYSICS\nCAMBRIDGE, MASS.\nRa or moth on innerwall.\nnickel electrodes.\ncm\nair at\npyrexglaso\n/atm.\nca3cm\n- approximate characteristics -\nI\n$\n2x109 amperes.\nca 100 volts\nR.D. Evans"
}