The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Chap. XXXIII.] RESONANCE. 441 body of the sound many of its elements; while the untrained person becomes conscious only of the fused whole, is aware only of the synthesis and not of the analysis. The details of this theory must, how- ever, be sought in the systematic text-books. It is referred to here only to show how a knowledge of the physical aspect of the problem is necess
The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Chap. XXXIII.] RESONANCE. 441 body of the sound many of its elements; while the untrained person becomes conscious only of the fused whole, is aware only of the synthesis and not of the analysis. The details of this theory must, how- ever, be sought in the systematic text-books. It is referred to here only to show how a knowledge of the physical aspect of the problem is necessary to a good comprehension of the physiological process. Resonance.—Sympathetic vibration offers an explanation of another remarkable occurrence. Take a tuning fork (B, Fig. 190) and cause it to vibrate by drawing a bow across it, or by striking it (the former pre- ferably), the sound emitted will be very feeble, and will be heard only when the ear is close to it. Hold it now close to the mouth of the tall jar A, still the sound is feeble. Then from a jug pour water slowly and as noiselessly as possible into the jar. The sound will be slightly in- tensified, till, when a certain quantity of water has been added, the amount being de- pendent upon the pitch of the fork, the sound will become greatly intensified so as to be heard over a con- siderable distance. Go on pouring in more water, the loudness of the note will slowly diminish, till it again becomes almost inaudible. It is evident that when the column of air in the jar is of a par- ticular length it intensifies the sound of the fork. If one could blow across the mouth of the jar so as to throw the air into vibration, the jaT itself Fig. 190.—Eesonance. The fork is represented as if touching the edge of the jar. This should not be so. It would also be better turned with the front of the limb facing the jar.
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