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James A. Van Allen journal, October 1955-March 1958
Page 26
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He merely beat the precessional frequency signal with an accurate tuning fork (vacuum tube controlled freq) signal which was good to 1/10⁶. He displayed the beat signal on a photographic record on a cathode ray scope, alongside a crystal controlled 50 c.p.s. signal. For example: Beat frequency with second harmonic of 1000 c.p.s. signal was 2.784 ± 0.005 c.p.s. Precessional frequency 1997.22 good to one part in 4 x 10⁵. (gamma sub [p?]) = 26,753 +- 0.6 (second exponent -1)(gauss exponent -1) ( N. F. Ramsey "Nuclear Moments" John Wiley 1953 )
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He merely beat the precessional frequency signal with an accurate tuning fork (vacuum tube controlled freq) signal which was good to 1/10⁶. He displayed the beat signal on a photographic record on a cathode ray scope, alongside a crystal controlled 50 c.p.s. signal. For example: Beat frequency with second harmonic of 1000 c.p.s. signal was 2.784 ± 0.005 c.p.s. Precessional frequency 1997.22 good to one part in 4 x 10⁵. (gamma sub [p?]) = 26,753 +- 0.6 (second exponent -1)(gauss exponent -1) ( N. F. Ramsey "Nuclear Moments" John Wiley 1953 )
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