The Effect of Water Vapor on the Mobility of Gaseous Ions in Air

In this paper additional results are given which indicate that an ${\mathrm{H}}_2$O molecule gives up an electron to the final positive air ion and thus forms an ${\mathrm{H}}_2$ ${\mathrm{O}}^{+}$ ion of a greater mobility. Results are also given showing that the reciprocal of the mobility bears a linear relationship to the humidity.