Abstract
Comparisons were made of the extinctions as measured with a photoelectric condensation nucleus counter, Dublin School of Cosmic Physics Model 1957, when the «over-pressure method» or the «under-pressure method» with equal pressure expansion ratios were used for producing the adiabatic cooling of the sample in, the fogtube of the counter. Due to theSchlarb effect the extinction measured by the second method is smaller than that by the first. Tables and graphs for converting the extinction obtained by one method into that by the other are given. The advantages of the underpressure method are given and discussed.
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