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James A. Van Allen journal, October 1955-March 1958

Page 25

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4 January 1956 "A Measurement of the Earth's Magnetic Field by Nuclear Induction" G.S. Waters Signals Research and Development Establishment (Ministry of Supply) Christchurch, Harts (submitted 4 Aug 1955) (Hampshire, England, near Southampton) Nature 176 691 (1955) Uses Packard-Varian proton precession magnetometer. 2πf = (gamma sub p)(H) (ala M. Packard & R. Varian Phys. Rev. 93 941 (1954) (AI) Used a very simple and ingenious method of measuring the precessional frequency:
 
Van Allen Papers