Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 297
f the sand: a single stroke has caused itto jump into a series of sharply defined concentric ringsvisible to you all. The vibrations here imparted to therod have communicated themselves to both the disks, anddivided each of them into a series of vibrating segments,separated from each other by lines… … the floor is a paper drum, d, with dark-coloured sandstrewn uniformly over it; I might stand on the table,—or indeed as high as theceiling, and produce theeffect which you are nowto witness. Pointing therod which unites theplates, in the directionof the paper drum, Idraw the resined…
Heat
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