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Particle size is a generic term and embraces a wide range of sizes of matter. In this discussion it will be limited to those sizes that will pass through the common commercial sieves. Of the many methods for determining particle size, only a few are fundamental, that is, do not require calibration by other methods. The microscopic method is one of these few. This discussion will be restricted to this method. Although in the literature its only value is stated to be as a calibration method for other methods, and it is more laborious than some other methods, nevertheless it is being used as a routine method of measurement in many places. Measurement of the image of a particle with a rule seems very direct compared with the measurement of a physical property correlated with the size and it gives a sense of validity.
Loveland, R. P.
Eastman Kodak Co., Rochester, N. Y.