This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...that produced with the pipe containing air. For a similar reason, the note yielded by the pipe containing carbon-dioxide would be graver than that in which air is the sonorous body. There are many ways of exciting an air-column so as to make it yield a musical note. A simple and instructive way is by ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...that produced with the pipe containing air. For a similar reason, the note yielded by the pipe containing carbon-dioxide would be graver than that in which air is the sonorous body. There are many ways of exciting an air-column so as to make it yield a musical note. A simple and instructive way is by means of a tuning-fork. The column of air in the glass cylinder, C oFig. 78), is thus acted upon by a tuning-fork, D, to one of the prongs of which is attached a disk, A, of the same diameter as the cylinder. By means of the disk the vibrations of the fork are communicated to all the particles of air at the opening of the tube. By pouring mercury into the tube, the proper sound of the air-column can be made to synchronize with that of the tuning-fork. The moment when the two notes are in unison is declared by a remarkable augmentation of sound. We shall study this phenomenon more attentively when we come to investigate the nature and cause of resonance. Suffice to say now that a column of air is always most strongly reinforced when its period is perfectly isochronous with that which throws it into vibration. Wind-instruments used in music are rendered sonorous by mouthpieces or by reeds. Hence their division into mouth-instruments and reed-instruments. Here (Fig. 79) are two organ-pipes, one made of wood and prismatic in form, the other of metal and cylindrical in form. The first is open at the top, and the latter closed. Hence the names used, --open pipes and stopped pipes. The air is admitted through the foot, P, into the chamber, K, whence it escapes through a slit, c. The sharp bevelled edge, a b, is called the lip. The space between the slit, c, and the lip, a b, is called the mouth, or embouchure. The precise manner in which vibrations..
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