By Paul. E Sabine
A few of the earliest books, rather these courting again to the 1900s and sooner than, are actually super scarce and more and more dear. we're republishing those vintage works in reasonable, top of the range, smooth variants, utilizing the unique textual content and art.
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Distribution of sound it at any time, there is added to the amplitudes at points in a single horizontal plane. direct sound from the source the combined effect of waves emitted earlier, which arrive, after a series of reflections from the bounding surfaces, simultaneously at the given point. The intensity at any intensity j. point j is j_i i i -t , thus the resultant of a large number of separate waves and varies in a most complicated manner from point to point. It is an interesting experience to walk about an empty room in which a pure tone is being produced and note this point-to-point variation.
On the physical side, the line of distinction between musical sounds and noises is not sharp. Many sounds ordinarily classified as noises will upon careful examination be found to have fairly definite Thus striking a block of wood with a hammer pitches. would commonly be said to make a noise. But if we assem- wood of the proper lengths, we find that the tones of the musical scale can be produced by striking them, and we have the xylophone, though whether the xylophone is really a musical instrument is perhaps a ble a series of blocks of matter of opinion.
This and other mechanical devices are described in full in Professor Dayton C. Miller's book, "The Science of Musical Sounds," 1 to of This which the reader The is referred for further details. " A machine for this purpose consists essentially of a series of elements each of which will describe a simple harmonic motion and means by which these motions may be combined into a single resultant motion which is recorded Perhaps the simplest mechanical means of graphically. M. is that indicated in Fig.