A Theory of the Chemical Action of the Electric Discharge in Electrolytic Gas . ^ For this purpose theMcLeod gauge was fitted with an arrangement for raising or lowering thereservoir of mercury with a slow screw motion after rough adjustment, anda mirror was placed beside the zeros of the gauge, so that with the help ofa lens the level of the mercury could be raised accurately to the zero wit hout 156 Rev. P. J. Kirkby. Chemical Action of the [Oct. 13, errors of parallax. In this way small pressures could be read to about0001 mm. The electrical connections are shown diagrammatically in fig. 2.
A Theory of the Chemical Action of the Electric Discharge in Electrolytic Gas . ^ For this purpose theMcLeod gauge was fitted with an arrangement for raising or lowering thereservoir of mercury with a slow screw motion after rough adjustment, anda mirror was placed beside the zeros of the gauge, so that with the help ofa lens the level of the mercury could be raised accurately to the zero wit hout 156 Rev. P. J. Kirkby. Chemical Action of the [Oct. 13, errors of parallax. In this way small pressures could be read to about0001 mm. The electrical connections are shown diagrammatically in fig. 2. Z was abattery of 1700 volts or less, and E was sometimes as much as 3 G was a DArsonval galvanometer such that the current corresponding toa deflection of the spot of light through about 67 mm. was 10^ ampere,which was the order of the currents used (see Table I). Method of hydrogen and oxygen having been introduced and the anode fixed ata certain distance, usually about 30 cm., from the cathode, the pressure wasadjusted and carefully determined. A steady current C of the order10^ ampere, but otherwise arbitrary, was then passed between the electrodesfor a few seconds t (between 5 and 12). Such small currents as this werenecessary, for in order to extend previous results it was necessary to workwith lower pressures than had hitherto been used, pressures even so low asۥ2 mm. ; and larger currents, on account of their greater chemical effects,would not have remained approximately constant for a time long enough tomeasure accurately with a stop-watch. Another great advantage in workingwith, very small currents is that the positive columphiltrans09259144
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