Abstract
For the measurement of particle size distribution the microscopic method has unequaled advantage over all other methods in that it can simultaneously determine both the particle size and the particle shape. Availing ourselves of such advantage of the microscopic method (in this experiment Shimadzu's Particle Size Frequency Analyzer for Microscope, Type SF-10 was used) we have been enabled to obtain the particle size distribution respecting both the length diameter and the mean diameter of the particles, and to obtain at the same time also the particle size distribution respecting Stokes' diameter by using the specific gravity balances, (in this experiment Shimadzu's Recording Sedimeter Type RS-11 was used). These experiments have afforded data to discuss how particle size disptribution is subject to the effect given by the particle shape. Among the sample powder used in these experiments will be mentioned α-alumina, glass ball and oxide iron.
