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 Excerpt: ...700. Describe the experiment, proving that sound is conducted by a metal with greater Telocity than by the air. 701. In what lines does sound move? 703. Explain Fig. 156. and show in what direction sound approaches and leaves a reflecting surface 0 This is illustrated by Fig. 156, where suppose a pistol to be fired at ...
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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 Excerpt: ...700. Describe the experiment, proving that sound is conducted by a metal with greater Telocity than by the air. 701. In what lines does sound move? 703. Explain Fig. 156. and show in what direction sound approaches and leaves a reflecting surface 0 This is illustrated by Fig. 156, where suppose a pistol to be fired at A, while the reflecting surface is at C; then the echo will be heard at B, the angles 2 and 1 being equal to each other. 704. Reverberation of Sound.--If a sound be emitted between two reflecting surfaces, parallel to each other, it will reverberate, or be answered backward and forward several times. Thus, if the sound be made at A, Fig. 157, it will not only rebound back again to A, but will also be reflected from the points C and D, and were such reflecting surfaces placed at every point around a circle from A, the sound would be thrown back from them all, at the same instant, and would meet again at the point A. We shall see, under the article Optics, that light observes exactly the same law in respect to its reflection from plane surfaces, and that the angle at which it strikes, is called the angle of incidence, and that under which it leaves the reflecting surface, is called the angle of reflection. The same terms are employed in respect to sound. 705. Reflection in a Circle.--In a circle, sound is reflected from every plane surface placed around it, and hence, if the sound is emitted from the center of a circle, this center will be the point at which the echo will be most distinct. Suppose the ear to be placed at the point A, Fig. 158, in the center of a circle; and let a sound be produced at the same point, then it will move along the line A E, and be reflected from the plane surface, back on the same line to A; and this will take place...
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Add this copy of A System of Natural Philosophy: in Which Are Explained to cart. $20.00, good condition, Sold by Between the Covers-Rare Books rated 5.0 out of 5 stars, ships from Gloucester City, NJ, UNITED STATES, published 1869 by Sheldon and Company.
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Seller's Description:
Good. Revised. Full leather with gilt stamped black spine label. Top edge of title page coming loose, rear board mostly detached, leather binding heavily scuffed on edges, good. Please Note: This book has been transferred to Between the Covers from another database and might not be described to our usual standards. Please inquire for more detailed condition information.
