r sheet of stiff cardboardabout eight and a half inches in diameter and draw concentric circleswith their circumferences near the edge of the wheel as in Fig. 135.On the inner circumference make 24 holes equally distant apart; on thesecond 30, and on the third 36, and on the fourth 48. Fasten… … Sound. 169 As the rate of rotate increases, the tone gets higher and higher until avery shrill note is pro -iuced, and asthe speed slackens the tone grad-ually lowers until only a series ofpuffs is heard. If such a wheel cannot be had,a long comb and a visiting cardwill do. By slowly snapping…
Physics
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