Physical Review, Vol. 21: A Journal of Experimental and Theoretical Physics; Conducted With the Co-Operation of the American Physical Society (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Physical Review, Vol. 21: A Journal of Experimental and Theoretical Physics; Conducted With the Co-Operation of the American Physical Society

An electric current of 2 ma. Was now passed from one of the electrodos E (figs. I and 2) as cathode and immediately the spec trum of hydrogen appeared in the cathode glow.l The gas pres sure also increased continuously with the time the current was maintained. After running about three quarters of an hour the rate Of evolution of gas became very small. This extra gas evolved (for silver about 2 c.c. At atmospheric pressure) could be absorbed by the na,k discharge in about an hour.2 If at the end Of this time a current was passed through the tube as before the gas pres sure began to increase as at first, but dropped within a very short time to a low rate of evolution. If now at this point a new metal were used as cathode there took place as usual a continuous in crease in gas pressure - the rate of evolution Of gas being the same for all fresh cathodes. This experiment repeated at various times and with different metals showed beyond doubt that the source of gas was solely in the cathode.

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