It is known that photographic paper is coloured without development and fixing when it is exposed to the daylight or a light source of relatively short wave length. When the precipiltation elements fall on a photographic paper and melt on it, the. areas wet by the precipitation elements are coloured a different colour from the other unwet areas. By the use of this phenomenon, the size or shape of the precipitation elements which fell on a photographic paper are simply recor, ded on the photographic paper. In this work, the relation between the volume of individual precipitation elements and the records coloured by them on the photographic paper were inves-tigated.
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