Abstract
A description is given of the construction of an electrograph recording photographically and of the setting up of an installation to obtain continuous records of the absolute value of the potential gradient above the surface of the Earth. Using this apparatus, continuous records were made over a period of 22 months, and a statistical survey of the data obtained is given. The existence of a maximum of potential gradient in mid‐summer as well as in winter is demonstrated. This and other minor phenomena are considered to be due to the effects of a variation in the relative distribution of wind‐directions during the year, and in some months during the course of the day. The argument is based upon the publications of Chree, Whipple, and Wait, on the influence of pollution and the concentration of condensation‐nuclei on the atmospheric potential‐gradient.
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