The nuclear magnetic resonance for protons in water was observed in magnetic fields of 6 and 12 gauss corresponding to Larmor frequencies of 25 and 50 kc, respectively. The line width was found to be determined by the frequency of modulation and here was approximately 3 milligausses. The ratio of magnetic fields for resonance was found to agree with the ratio of Larmor frequencies within the experimental error, estimated at 0.01 percent.
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Richard M. Brown (1950) studied this question.
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