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James A. Van Allen journal, October 1955-March 1958
Page 257
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J. H. Banks "Elements of Mathematics" Allyn & Bacon, Inc. (1956) An excellent elementary text in the logical and conceptual aspects of mathematics ---------------------------------- 1/25/1958 Recently (~1/9/1958) while in Washington, I discussed our new magnetic measurements with Dr. Bell of O.N.R. He told me of a new principle upon which a weak-field magnetometer may be based , called an "optical pumping " method. I did not adequately understand the principle but it was described as consisting of a bulb filled with Na vapor (at ordinary temperatures ~20 degrees Celsius) through which was passed a polarized
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J. H. Banks "Elements of Mathematics" Allyn & Bacon, Inc. (1956) An excellent elementary text in the logical and conceptual aspects of mathematics ---------------------------------- 1/25/1958 Recently (~1/9/1958) while in Washington, I discussed our new magnetic measurements with Dr. Bell of O.N.R. He told me of a new principle upon which a weak-field magnetometer may be based , called an "optical pumping " method. I did not adequately understand the principle but it was described as consisting of a bulb filled with Na vapor (at ordinary temperatures ~20 degrees Celsius) through which was passed a polarized
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