The cyclotron resonance frequency of the proton has been measured using a new method. By measuring the spin precessional frequency of tie proton in the same magnetic field, the proton magnetic moment in nuclear magnetons has been determined as Mp=2.79276=k0.00006. In combination with other data this result can be used directly to determine the charge-to-mass ratio of the proton e/ilf p =9579.4 2 db0.3 emu/g, the faraday F=9652.0 3 ±0.3 emu/g (physical scale), and the ratio of the proton mass to the electron mass M p /w e =1836.12±0.05. A preliminary value for the H 2 -D doublet is given. Goudsmit, Phys. Rev. 74, 622 (1948). 2 J. A. Hippie and H.

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