Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 255
—Fasten with a screw the elastic brass plate A (Fig.J91) on the upright support. Strew writing-sand over the plate, draw a 238 MOLAR DYNAMICS. rosined bass bow steadily and firmly over one of its edges near a corner,and at tlie same time touch the middle of one of its edges with the tipof the… … Fig. 191. an edge, and touch with a finger one of its corners; the sand will arrangeitself in two diagonal rows (2) across the plate, and the pitch of the notewill be a fifth higher. Touch, with the nails of the thumb and fore-finger, two points a and 6 (3) on one edge, and draw the bow across…
Physics
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