Appleton, 1867 - 335 páginas

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Página 46 - ... average temperature. This change of temperature, produced by the passage of the sound-wave itself, virtually augments the elasticity of the air, and makes the velocity of sound about £th greater than it would be if there were no change of temperature. The velocity found by Newton, who did not take this change of temperature into account, was 916 feet a second. Laplace proved that by multiplying Newton's velocity by the square root of the ratio of the specific heat of air at constant pressure,...
Página 5 - With regard to the point now under consideration, you will, I trust, endeavour to form a definite image of a wave of sound. You ought to see mentally the air particles when urged outwards by the explosion of our balLoon crowding closely together ; but immediately behind this condensation you ought to see the particles separated more widely apart. You ought, in short, to be able to seize the conception that a sonorous wave consists of two portions, in the one of which the air is more dense, and in...
Página 233 - All good and honour might therein be read; For there their dwelling was. And when she spake. Sweet words like dropping honey she did shed ; And twixt the pearls and rubies softly brake A silver sound, that heavenly music seem'd to make. Upon her eyelids many graces sate, Under the shadow of her even brows...
Página 1 - When the finger is wounded, the sensor nerves convey to the brain intelligence of the injury, and if these nerves be severed, however serious the hurt may be, no pain is experienced. We have the strongest reason for believing that what the nerves convey to the brain is in all cases motion.
Página 81 - Through the two floors passes a tin tube 2£ inches in diameter, and along the axis of this tube passes a rod of deal, the end of which emerges from the floor in front of the lecture table.
Página 35 - Laplace, by a special assumption, deducing from these velocities the ratio of the specific heat of air at constant pressure to its specific heat at constant volume.
Página ix - In the following pages I have tried to render the science of Acoustics interesting to all intelligent persons, including those who do not possess any special scientific culture.
Página 316 - The transmission, however, is not direct. At a certain place within the labyrinth exceedingly fine elastic bristles, terminating in sharp points, grow up between the terminal nerve fibres.
Página 225 - I observed that the flame of the last-mentioned burner exhibited pulsations in height which were exactly synchronous with the audible beats. This phenomenon was very striking to every one in the room, and especially so when the strong notes of the violoncello came in. It was exceedingly interesting to observe how perfectly even the trills of this instrument were reflected on the sheet of flame. A deaf man might have seen the harmony.
Página 333 - Patient Waiting no Loss. . Nothing Venture Nothing Have. Out of Debt Out of Danger. . Contentment Better than Wealth. . No Such Word as Fail. All's Not Gold that Glitters. A Place for Everything, and Everything in its Place. Loss and Gain. Pet Bird. Home Series of Juvenile Books. 8 vols. in case. Haven (Memoir of Alice B.). Hazard on the Will. Keeker's Questions of the Soul. Hemans

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