Lessons in Elementary Practical Physics; Stewart and Gee Series. Practical Acoustics Volume 3, PT. 1
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Lessons in Elementary Practical Physics; Stewart and Gee Series. Practical Acoustics Volume 3, PT. 1

Lessons in Elementary Practical Physics; Stewart and Gee Series. Practical Acoustics Volume 3, PT. 1


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About the Book

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. 1897 edition. Excerpt: ... we get the same curves as with the tuning-forks on pp. 115, 116. Lastly, when the paper itself moves with a harmonic vibration, as in certain harmonographs, curves of exquisite beauty are obtained. The apparatus is shown in Fig. 50. Two large tuning-forks are fixed to firm and heavy supports, so that their planes of vibration are at right angles. Each fork has a small piece of silvered glass at tached to one of its prongs in such a way that a narrow beam of light proceeding from a lamp is reflected first from one and then from the other. A small counterpoise is attached to the opposing prongs so as to maintain the balance. The observer stands at some little distance, and receives the twice-reflected beam through a telescope (the room being in darkness); when only one fork is vibrating he sees a straight line, vertical or horizontal as the case may be, but when both are in motion, curves such as those in Fig. 51 make their appearance, according to the rates of vibration. In general, they do not remain steady, unless the forks are perfectly in tune, but go through a cycle of changes in the period required for one of them to gain a complete vibration of the other, i.e. they go through all possible phase differences, as explained on p. 111. No other method of number of times the curve touches two adjacent sides of the rectangle which encloses it, and this is the ratio required. If the curve be not closed, as in the third column of Fig.-51, count one for each free end, and two for each of the other contacts. Thus, in the curve of the Fourth, 3:4 (middle figure, bottom row), we read 1 + 2 contacts along the top, and 2 + 2 down the right-hand side (or 1 + 2 + 1 down the left-hand side). Reguired.--Apparatus shown in Fig. 52, ...


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Product Details
  • ISBN-13: 9781234145248
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 48
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1234145243
  • Publisher Date: 14 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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