domain photo from Perrin's 1909 original article, see also http://www.matpack.de/Info/images/Thermodynamics/PerrinPlot2.gif or J. B. Perrin, "Mouvement brownien...
is 3.2 µm) Date 1909 Source SVG drawing based on File:PerrinPlot2.gif, itself from J. B. Perrin, "Mouvement brownien et réalité moléculaire," Ann. de...