Show A very aery pretty in acon veles nay may he perform etl us its follows take a thin I 1 anil and high sounding noun soun dius diug cut glab tumbler fill 1111 it full or of wate rawl place ou all it its hor bar ers after drying them well irell A TOM arms i of equal brau branches clies cut from paper turn donn at ri bt anglese the ank of the li rinch of the cross in order to la prevent it front from slipping slip pins down the sided to vibrate by br bibbing sonic onie put of its exterior surface with your net finker fin Kir a waif if aou 3 on wre were going to make it nug jou will tt ill merceir perce perc eie ir the gla Klasa to arnit it 11 sound hut but more than thi alm you yon will notice the follon following ring it if your fanger rub rubs i the gla nl i i under one of the branches branche of the paper aroks ros ro s lift latter 1 mil I rent tin stationary but if on the you reiba nib a piert of the glass ahven 11 een tile llie branches bran chea of the club cintes the crabl will be I 1 I 1 11 ft pt 27 it I 1 ra I 1 I 1 0 I 1 I 1 I 1 I 1 I 1 41 I 1 11 I 1 1 10 A 1 I 1 1 Z all 1 1 1 THI ML GLASS pin gill to turn slowly its it obeyed some rang musical ical influence and will not iop op until i 1 lie end of one of the branches arrived arm ch over ever tile the part rubbed by the finger thus thu you perceive that in fit moving movin the finger around the bliss you make n aku the ross cross turn aa you please ehn experiment simple though it ft Is demonstrates the existence or of the points 0 of i least motion which are called in acoustics ti node nodes s and of Yet ventral itral segments heg ments of vibration ti the noile nodes i here the brunches branches ot at atlie tl stop are the points in which the borders of the are at rest st The ventral he hey ienn beti veen aea abe nodes fire the in fit which the vibration brition ri of the borders border 4 is the most sensitive and on vt hibb the br branches auches of the tha brosi cou id clot bot remain remda at remt |