Scientific amusements . Sound Figures. to find the pitch of By maintaining this rate for aminute or less, and setting the gear to tell the revolutions,the number will be found marked on the dial of theapparatus. So by multiplying the number of revolutionsof the disc by the number of the holes, and dividing theproduct by the number of seconds during which the discwas in connection with the recording gear, we shall havethe number of vibrations per second necessary to producethe pitch corresponding to the given sound. The aboveis the description of one form of Syren ; there are others,which, howe
Scientific amusements . Sound Figures. to find the pitch of By maintaining this rate for aminute or less, and setting the gear to tell the revolutions,the number will be found marked on the dial of theapparatus. So by multiplying the number of revolutionsof the disc by the number of the holes, and dividing theproduct by the number of seconds during which the discwas in connection with the recording gear, we shall havethe number of vibrations per second necessary to producethe pitch corresponding to the given sound. The aboveis the description of one form of Syren ; there are others,which, however, we need not detail. We have seen that there are certain nodal points, or 194 SOUND. res^ing-places, in vibrations, and this can easily be shownupon a fiddle-string-, from which paper discs will fall offexcept on the nodal point, showing that there is novibration there. The same experiment may be made bymeans of plates, which will give us what are termedChladnis figures. Suppose we strew a glass-plate withfine sand,
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
