Abstract
THE development of automatic apparatus, generally employing optical scanning systems in conjunction with electronic counters, for determining the number and size of a population of small particles randomly dispersed in one plane has aroused considerable interest during recent years. Walton1 has summarized some of the chief trends and methods used in the design and operation of such apparatus. Hawksley2 has pointed out that, whereas counting can be carried out by relatively simple instruments, all proposals for methods of size determination have involved the measurement of pulse-heights or pulse-lengths from the records obtained from photoelectric scanning devices. He showed, however, that it is possible to derive a value for the mean diameter of the particles from a series of counts made with scanning spots of different sizes, so that sizing can be carried out with simple counting apparatus. He also implies that similar results could be obtained if the ‘response-level’ of the detecting device is altered during successive counts, but fails to follow up this suggestion.
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