. The Ontario high school physics. are ordi-narily square or circular in shape. The plate is held by asuitable clamp at its centre, and is made to vibrate by aviolin bow drawn across the edge. Let us scatter some sand over a square plate, and while a finger-nail touches it at themiddle of one side drawthe bow across the edgenear one corner. At oncea clear note is given, andthe sand takes up the figureshown in Fig. 221a. Ifthe corner is damped withthe finger-tip and the bowis applied at the middle ofa side, the form shown in h is assumed, and the note is higher than the former. By damping with
. The Ontario high school physics. are ordi-narily square or circular in shape. The plate is held by asuitable clamp at its centre, and is made to vibrate by aviolin bow drawn across the edge. Let us scatter some sand over a square plate, and while a finger-nail touches it at themiddle of one side drawthe bow across the edgenear one corner. At oncea clear note is given, andthe sand takes up the figureshown in Fig. 221a. Ifthe corner is damped withthe finger-tip and the bowis applied at the middle ofa side, the form shown in h is assumed, and the note is higher than the former. By damping with two finger-tips the form c is obtained and a much higher note is produced. The sand is tossed away from certain parts of the surface and collects along the nodal lines, that is, those portions which are at rest. Some of the forms assumed by the sand when a circular plate is vibrated are shown in d, e, f. The sand-figures always reveal the character of the vibration, and the more complicated the figure, the higher-pitched the Fio. 221.—Sand-figures showing nodal lines invibrating plates. VIBRATIONS OF AIR COLUMNS; RESONANCE 198
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
