Lessons in Physics

Lessons in Physics

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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. 1903 edition. Excerpt: ...twentyeight vibrations per second; the octave below, half as many, '--one hundred and thirty-two per second. The interval between C and the octave above is divided into seven tones, and the whole is called a scale. A man's voice can rarely make a tone lower than one hundred and fifty vibrations per second; but in the shrill cries of children the pitch sometimes runs up into some thousands of vibrations. 184. Quality.--You have perhaps heard a piano and a cornet sound the same tone; it has exactly the same pitch and may be equally loud in both cases, yet there is a difference: you would never mistake a piano tone for that of a cornet. Take any two kinds of instruments you please and try it. No matter if they all do sound the same tone and equally loud, you can always pick out a horn, a wood instrument, a violin, or a banjo, and make no mistake. Each sound has a distinct character, which seems to depend upon what sort of an instrument made it; this is what is meant by the quality of a tone. Examples of it are very common. As has been shown, the tones of different instruments sounding the same note may be just alike in pitch and loudness, and yet by their quality we could easily tell one from another. In the same way, two of our acquaintances may speak the same words with just the same pitch and loudness, but we could easily tell the voices apart. It is by the quality of a person's voice that we recognize it. So there are these three features of a tone, --loudness, pitch, and quality; and if we stop and think, we shall find that all differences in sounds of any sort are due to differences in one or more of these features. 185. Vibration in Parts; Overtones.--A string may be made to vibrate as a whole (a, Fig. 132); at the same time it may be...show more

Product details

  • Paperback | 90 pages
  • 189 x 246 x 5mm | 177g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236487702
  • 9781236487704