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. 1896 edition. Excerpt: ...be employed, and sometimes with advantage. Very low notes can be got from spherical resonators, such as the large globes employed for demon 1 Proc. Roy. Inst. vol. vm. p. 536, 1878; Nature, vol. xvm. p. 319, 1878. 2 Quart. Journ. Sci. vol. v. p. 274, 1818. 2 Pogg. Ann. vol. cix. pp. 1, 426, 1860. ...
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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. 1896 edition. Excerpt: ...be employed, and sometimes with advantage. Very low notes can be got from spherical resonators, such as the large globes employed for demon 1 Proc. Roy. Inst. vol. vm. p. 536, 1878; Nature, vol. xvm. p. 319, 1878. 2 Quart. Journ. Sci. vol. v. p. 274, 1818. 2 Pogg. Ann. vol. cix. pp. 1, 426, 1860. strating the combustion of phosphorus in oxygen gas. A globe of this kind gave in its natural condition a deep and pure tone of 64 vibrations per second. When it was fitted with a longer and narrower neck formed from a pasteboard tube, the calculated frequency fell to 25, and the vibrations, though vigorous enough to extinguish the flame, were hardly audible. When it is desired to excite very deep sounds, the supply tube should be made of considerable length, and the orifice must not be much contracted. Singing flames may sometimes replace electrically maintained tuning-forks for the production of pure tones, when absolute constancy of pitch is not insisted upon. In order to avoid progressive deterioration of the air, it is advisable to use a resonator open above as well as below. A bulbous chimney, such as are often used with paraffin lamps, meets this requirement, and at the same time emits a pure tone. Or an otherwise cylindrical pipe may be blocked in the middle by a loosely fitting plug1. As Wheatstone shewed, the intermittence of a singing flame is easily made manifest by an oscillating, or a revolving, mirror. A more minute examination is best effected by the stroboscopic method, 42. Drawings of the transformations thus observed have been given by Topler2, from which it appears that at one phase the flame may withdraw itself entirely within the supply tube. Vibrations capable of being maintained are not always selfstarting. The...
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Seller's Description:
Very Good. Second edition. Very good in pictorial stiff paper covers. Former owner's name stamp on top edge and on front endpaper. Spine sunned. 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.