Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 675
t taking a photomicrograph of the sample,at a carefully ascertained magnification, and secondly again en-larging by means of a stereopticon and then measuring the par-ticles on the projecting screen, is described. It comprises:Vol. 192, No. 1151—48 666 Henry Green. [J. F. I. (a) The method of… … Barytes, J^oo Diameters.On account of the low uniformity of barytes it would take about 20 times the number ofparticles shown here in order to make a successful particle measurement of it. (d) The calculation of the probable error. (ej The determination of the uniformity coefficient. 2. The meaning…
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