Physics – Popular Physics
Scientific paper
2010-07-31
Physics
Popular Physics
14.1 pages, 11 figures, to be published in the American Journal of Physics. This differs from the previous version only in the
Scientific paper
A discussion is given of Robert Brown's original observations of particles ejected by pollen of the plant \textit{Clarkia pulchella} undergoing what is now called Brownian motion. We consider the nature of those particles, and how he misinterpreted the Airy disc of the smallest particles to be universal organic building blocks. Relevant qualitative and quantitative investigations with a modern microscope and with a "homemade" single lens microscope similar to Brown's, are presented.
Bart Kenneth
Bilderback David
Collett Brian
Newman Dara
Pearle Philip
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