Acoustics & Sound For Musicians - Online Book

The Theory Of Sound Which Constitutes The Physical Basis Of The Art Of Music.

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	III. § 39.]          RESONANT AIR-COLUMNS.                      77
	soon after striking it to prevent the other from making itself heard. 39. A column of air is easily set in resonant vibration by a note of suitable pitch. The roughest experiment suffices to establish this fact. We have only to roll up a piece of paper, so as to make a little cylinder twelve inches long and an inch or two in diameter, with both ends open, strike a common C tuning-fork, \fl\ ~°
	one of the apertures. As soon as the fork reaches the position (l) Fig. 22* its tone will unmistakably swell out. In order to estimate the increase of intensity produced, it is a good plan to move the fork rapidly to and fro, a few times, between the positions (l) and (2).
	In the first case we have the full effect of resonance, * This figure was drawn for a cylinder only six inches in length, but suffices for the purpose of illustration for which it is here used.