Wonders in Acoustics; Or, the Phenomena of Sound, from the Fr. the Engl. Revised by R. Ball

Wonders in Acoustics; Or, the Phenomena of Sound, from the Fr. the Engl. Revised by R. Ball

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 edition. Excerpt: ... From the two sides of each node the particles move in contrary directions; compression takes place when the node becomes the meeting-place of two files, and dilatation when it is the starting-point of two files moving away again (Fig. 64). It often happens that a string is stirred at the same time by longitudinal and transverse vibrations, more or less complicated, to which may be also added rotating vibrations. Each particle then describes an orbit in the form of a spiral slightly distorted. If you picture a poor fiddle-string tortured by the bow of the fiddler, who strokes it and strikes it, pinches and stretches it by turns, you will Fig. 64 not marvel to see it execute curves such as no geometer has ever dreamed of. To get transverse vibrations from a prismatic metal plate, k may be either fixed by one end or laid upon two triangular wedges (Fig. 65). A series of centres and nodes Fig 65. will then be seen, whose distribution depends on the manner in which the rod is supported. The general rule is that there are always centres at the free extremities, and nodes at the fixed points. The nodes are shown under the form of straight lines, which cross the plate, and which A chord cannot vibrate transversely without lengthening slightly, and this occasions longitudinal vibrations. This longitudinal sound is sometimes recognisable in the la of the violoncello. may be rendered visible by throwing sand upon the plate while it vibrates. The grains of sand unable to remain at the centres, where the tumult is at its height, take refuge at the nodes, which afford them a quiet asylum, and group themselves in fine right lines, called the lines of repose, or nodal lines. Tuning-forks belong to the same category as the prismatic metal plates; they vibrate so...show more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236574737
  • 9781236574732