Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 670
r of methods have been developed for the measure-ment of colloidal particles. The photomicrographic method is notapplicable to this type and therefore it will not l^e discussed here. Nov., 1921.] Photomicrographic Method. 661 It is hardly necessary to state that the photomicrographicmethod has been… … French Process Zinc Oxide, 1500 Diameters.This particular sample of French Process Zinc Oxide approaches the limit of fineness towhich the photomicrographic method is applicable. To go below this will require quartz lensesand ultra-violet light. It seems to the author that the method of grain size…
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