Comparison of the Masses of He and $H^{1}$ on a Mass-Spectrograph

The ratio of the masses of He and

H^{1}

was measured by comparison of

{He}^{+ +}

with

H_{2}^{1 +}

on fourteen spectra, and the measurements give He:

H^{1}

=3.971283±0.000042. If He=4.00216±0.00013 on the

O^{16}

scale as given by Aston, then

H^{1}

=1.007775±0.000035 in excellent agreement with the value 1.00778 reported by Aston. A method is suggested for the determination of the mass of

H^{2}

in terms of He and C.

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Comparison of the Masses of He andH1on a Mass-Spectrograph