The book Sound And Music was written by author John Augustine Zahm Here you can read free online of Sound And Music book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Sound And Music a good or bad book?
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1 accelerated, and the pitch is §| heightened as in the case of H the siren just used. There is but one step from the mill-siren to a very sim- ple and primitive instrument, to which I wish now to direct your attention. I show it to you to emphasize what I have thus far been insisting on, — namely, that sound ex- ternally to the ear is merely a mode of motion, and that when motion is properly timed, sound is always the result. The instrument referred to is called a musical sling, and con- sists... of simply a thin plate of metal (Fig. 10) about three by six inches in size, and attached to a string. I take hold of the string and give the plate a whir- ling motion, making it describe a circle in the air. The resist- ance of the air causes the plate rapidly to revolve around its longer axis, and to give forth, first a flutter, and then the more acute musical sound which is distinctly audible in every part of the room. A more interesting way of throwing the air into periodic pulsations is by means of a jet of burning gas, preferably hydrogen.
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