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It is shown t hat t l:e "effective" opening of. testin g sieves is generally somewhat la rge r than. t he average opel1ln g. or the n?nunal opellin g. A method of measuri ng t he effective opemng by means of a calIbrated mIx t ure of glass spheres is described. Glass beads of the t ype used for highway markin gs were a s ui table source of glass sp}l eres for s izes from 80 to 1,000 mIcron s (U. S. Sieves No. 170 through 18) . Details are give n for the se lection of the spheres , t he preparati<?n of t he desired mixture of spheres, subdi vision of the sa mples, t he measurement of t he cllameters, and the calcula tion of t he weight-size dist ri bution. :From a stati stical allal ysi ~ of t he calibration data, both t he reproducibility and accuracy of the method were found In general to be abo ut 1 percent.

Glass spheres for the measurement of the effective opening of testing sieves