Tyndall, John, 1820-1893 · New York : Appleton · leaf 187
S&y • t -■^■V vSy&s/ii ? f < ■--■: <jP- - ■* ■■* ftOviy * ■■<;•;.*&*§=: ■,l ^V.1^ i • iiiA-.-^- ~ i^.J^cS 3 $,Z9A> ■■•- .3&S- … An effect of vibrating plates which long perplexedexperimenters is here to be noticed. When with the sandstrewed over a plate a little fine dust is mingled, say thefine seed of lycopodium, this light substance, instead ofcollecting along the nodal lines, forms little heaps at theplaces of most…
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