A Text-Book of Physics Volume 2

A Text-Book of Physics Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...of vibration of particular points in strings. It is represented in Fig. 38, and consists of a tuning-fork which carries at the end of one prong the objective, L, of a microscope with fixed eye-piece, M. The fork is electrically maintained by the electro-magnet E. B is a small Fio. 39.--Curve of violin-string given by vibration microscope with which it is in unison; abt line seen when fork alone vibrates; cd, curve seen when the string also vibrates. C, time circle with diameter equal to ab. The dotted lines being drawn through equidistant points on tbe circumference of C, mark off equal times, ef is the time displacement diagram for the vibration of the string, the time scale being vertical. weight for adjusting the pitch to a slight extent. The string, of which the vibration is to be investigated, is fixed vertically in the field of view of the microscope with a starch grain on it to serve as a luminous point. If the fork alone moves, the point is lengthened out into a bright vertical line, but when the string also moves the point traces out a curve. In Fig. 39 cd represents the curve given in a particular case by a violin-string in unison with the fork, ab is the vibration due to the fork alone, and since this vibration is harmonic, we at once get a time scale by drawing a THE VIBRATION MICROSCOPE. 79 circle with diameter ab, and drawing a series of horizontal lines through equidistant points on the circumference. Where these meet the curve cd, we have the positions of the point at successive intervals of tune. Plotting out the horizontal ordinates at the successive instants on a new time scale, ef, we get the time displacement diagram of the vibration of the point on the string. CHAPTER VI. THE TRANSVERSE VIBRATIONS OP STRETCHED...show more

Product details

  • Paperback | 56 pages
  • 189 x 246 x 3mm | 118g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236810325
  • 9781236810328