Abstract
A description is given of an attempt to adapt a Pollak-Nolan photo-electric nucleus counter for the purpose of obtaining a general picture of the size frequency distribution of an aerosol of Aitken nuclei. The principle of the method is that of differential evaporation of the large and small water droplets formed at an expansion on different sized nuclei in the counter. A number of features of fog decay in a counter, which militate against the success of the method, are recorded. The results obtained with the spectrometer are discussed in the light of the difficulties encountered.
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