Abstract
Summary In the following pages the results are given of the measurements of the number and the average life of ions, and of the number of charged and uncharged condensation-nuclei in the air on the open sea. The number of fast ions was constantly recorded with the aid of an Ebert-aspirator combined with an electrometer-triode. We watched the diurnal variation in Bandoeng, the influence of our approach to the coast, of fog and of rain and we tried to determine the mobility-spectrum. The average of all the measurements of ions caught in the aspirator was 213 ions per cc of air. Following Schweid1er's “Method II” the “half-value voltage” was determined; as an average we find H = 0.80 Volt, corresponding to an average life ϑ = 63 sec. Calculation of the ionisation on the ocean from the balance (see preceding paper) gives as an average q = 2,0 J, in sufficient agreement with the value q between 1,8 and 2,1 J, due to cosmic radiation only.
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