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. 1888 Excerpt: ... musical murmur often heard near telegraph lines? 22. Why will a variation in the quantity of water in a goblet, when this is made to sound, cause a difference in the tone produced by its vibration? 23. At what rate (in meters) will sound move through air at sea-level, the temperature being 20 C.I SUMMARY. Sound is ...
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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. 1888 Excerpt: ... musical murmur often heard near telegraph lines? 22. Why will a variation in the quantity of water in a goblet, when this is made to sound, cause a difference in the tone produced by its vibration? 23. At what rate (in meters) will sound move through air at sea-level, the temperature being 20 C.I SUMMARY. Sound is produced by vibrations. These are transmitted in waves through the air (60 F.) at sea-level at the rate of 1,120 ft. per second; through water four times, and through iron fifteen times as fast. In general, the velocity depends on the relation between the density and the elasticity of the medium; and the intensity is proportional to the square of the amplitude of the vibrations. Sound, like light, may be reflected and refracted to a focus. Echoes are produced by the reflection of sound from smooth surfaces, not less than 112 ft. (about 33 meters) distant. Rapidly-repeated vibrations make a continuous sound; regular and rapid vibrations produce music; irregular ones cause a noise. The pitch of a sound depends on the rapidity of the vibrations. The number of waves, and their consequent length in a given sound, is found by means of the siren. Unison is produced by identical wave-motions. Any number of sound-waves may traverse the air, as any number of water-waves may the surface of the sea, without losing their individuality. The motion of each molecule of air is the algebraic sum of the several motions it receives. Two systems of waves may therefore destroy or strengthen each other, according as they meet in oppo Several acoustic phenomena have become of historical interest. (1.) Near Syracuse, Sicily, is a cave known as the Ear of Dionysius. A whisper at the farther end of the cavern is easily heard by a person at the entrance, though the distance...
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Add this copy of Popular Physics to cart. $15.00, good condition, Sold by Richard Burlew rated 5.0 out of 5 stars, ships from Trumansburg, NY, UNITED STATES, published 1896 by American Book Co..
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Add this copy of Popular Physics to cart. $65.23, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Hansebooks.
