Musical World Volume 10-11

Musical World Volume 10-11

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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. 1854 edition. Excerpt: ...end to end of its narrowest edge, and with a slim straight handle of the same metal terminating in a knob, and you have the rocker. The mode of using it will be presently explained. Professor Faraday next took up the subject, and made it the theme of a lecture which he delivered at the Royal Institution, embodying an explanation of the phenomenon--lucid and apprehensible, aa hU explanations always are. He confirmed Mr. Trevelyan'a view aa to the tones being due to an alternate expansion and contraction caused by the heat-This it is that set; the rocker vibntting; and according to the rapidity or slowness of the vibrations, suoh a the pitch of the tone. The particular way in which the expansion takes place is, that the groove in the edge of the rocker makes it a double edge, and whenever the heated rocker ia placed resting on a mass of lead, couple of little prominences or hills rise up immediately under the points of contact, being the natural effect of expansion caused by heat. At the same moment the rocker begins to yibrat-, and no sooner is one side raised than the hill on that side suddenly sinks, owing to the rapid absorption of Its heat by the surrounding mass of lead. The consequence it, that the roeker descends through a greater distance than it rose, whereby the other edge being raised, the same effect ia produced on the opposite side; and thus the vibrations continue as long as there is a sufficient difference of temperature between the two motels. The movement as here described, affords an instance of a curious maintaining power; for "the force which really lifts the rocker is on one side of the center of gravity, while the rising side of the rocker itself is on the other; and the point "under process more

Product details

  • Paperback | 554 pages
  • 189 x 246 x 28mm | 975g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236599462
  • 9781236599469