Abstract
SOME time ago Prof. Chattock arid I attempted to measure the velocity of the ions from a point discharging in pure arid impure hydrogen at atmospheric pressure by the wind-pressure method, in the hope of finding that the negative ion was influenced by the presence of small traces of oxygen. The results were given in Phil. Mag., April, in which it was shown that the change which the complete elimination of oxygen caused was surprisingly great. Thus the apparent specific velocity of the negative ion in pure hydrogen was >23O cm. sec.-1, volt cm.-1, but it rapidly dropped to 7.6 on the addition of oxygen up to 1 per cent. The velocity of the positive ion was unaffected by traces of oxygen impurity, and was 5.8 throughout.
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