. The Ontario high school physics. e must judge tlie correct positions of thefingers himself. 237. Pipe Organ and Flute. The actionof organ pipes has been explained in§§ 225, 226. In large organs they varyin length from 2 or 3 inches to about 20feet, and some of them are conical inshape. In Fig. 243 is shown a flute. This is aninstrument of great antiquity, though themodern form is quite unlike the old driving a current of air across tlie thinedge of the opening, Mhich is near one end,the air column within is set in vibrationmuch as in an organ pipe. In the tubethere are holes which ma
. The Ontario high school physics. e must judge tlie correct positions of thefingers himself. 237. Pipe Organ and Flute. The actionof organ pipes has been explained in§§ 225, 226. In large organs they varyin length from 2 or 3 inches to about 20feet, and some of them are conical inshape. In Fig. 243 is shown a flute. This is aninstrument of great antiquity, though themodern form is quite unlike the old driving a current of air across tlie thinedge of the opening, Mhich is near one end,the air column within is set in vibrationmuch as in an organ pipe. In the tubethere are holes which may be opened oTclosed by the player, opening a hole beingequivalent to cutting off the*tube at thatplace. The overtones are also used, beingobtained by blowing harder. The fife and the piccolo resemble theflute, both being open at the further , on the other hand, are usuallyclosed. 238. Reed Instruments. In the ordinary organ, the mouth-organ, the accordion and some other instruments the vibrating REED INSTRUMENTS 21]. Fig. 245.—An organ reed. The tongueA moves in and out of the is called a, free reed. body is a reed, such as is shoAvn in Fig. 245. The tongue A vibrates in and out of an opening which it accurately fits, the motion being kept up by the current of air which is directed through the opening. In some organ pipes reeds areplaced, but the note produced is due chiefly to the air columnin the pipe, the reed simply serving to set it in vibration. In Fig. 244 is shown a clarinet. This instrument has holesin the tube which are covered by keys or by the fingers of the pla^^er. The air in the tube is put in vibration by means of a reed made of cane shown in Fig. 246. The reed is very flexible,_ „ ^ and the note Fig. piece of the heard is that of clarinet. The reed R covers the air column, the opennig. not of the this case the reed simplycovers and uncovers theopening in the mouthpiece, being too large to pass into theopenin
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