Library of universal knowledge, science, Том 7P.F. Collier and Son., 1905 |
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aerial agitated atmosphere audible augmented beats bell burner carbonic acid cause centre column of air condensation consonance Consonance and Dissonance corresponding density direction disk dissonance distance divided echoes effect elasticity experiments figure fork fundamental tone gases glass hear heard heat Helmholtz Hence illustrated impulses inches instrument intensity interval layers length light liquid membrane ment miles minor third Montlhéry motion musical intervals musical sound nodal lines nodes number of vibrations observed obtained octave organ-pipe orifice oscillation overtones particles pass pendulum pipe pitch placed plate produced Prof prongs pulses rapidity rarefaction rates of vibration ratio reach reed reflected rendered resonance resultant tone rotation screen sensitive flame siren sonorous wave sound-wave South Foreland square stretched string surface temperature tion Trinity House tube tuning-fork tympanic membrane unison vein velocity of sound ventral segments vibrating segments Villejuif whistle wire
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Стр. 293 - Plateau, will remember that when two spherules of olive-oil suspended in a mixture of alcohol and water of the same density as the oil, are brought together, they do not immediately unite. Something like a pellicle appears to be formed around the drops, the rupture of which is immediately followed by the coalescence of the globules into one. There are organisms whose vital actions are almost as purely physical as...
Стр. 448 - IX BY THE division of a string Pythagoras determined the consonant intervals in music, proving that, the simpler the ratio of the two parts into which the string was divided, the more perfect is the harmony of the sounds emitted by the two parts of the string. Subsequent investigators showed that the strings act thus because of the relation of their lengths to their rates of vibration. With the double siren this law of consonance is readily illustrated. Here the most perfect harmony is the unison,...
Стр. 463 - But there is no mention of any interval ; and had such existed, surely the word " followed," instead of " accompanied," would have been the one employed. The echoes, moreover, appear to have been continuous, while the clouds observed seem to have been separate. " Ces phenomenes," says Arago, " n'ont jamais eu lieu qu'au moment de 1'apparition de quelques nuages." But from separate clouds a continuous roll of echoes could hardly come. When to this is added the experimental fact that clouds far denser...
Стр. 32 - We could thus transmit a push through a row of a hundred boys, each particular boy, however, only swaying to and fro. Thus, also, we send sound through the air, and shake the drum of a distant ear, while each particular particle of the air concerned in the transmission of the pulse makes only a small oscillation.
Стр. 460 - Transactions," could be safely employed in experiments on the mutual reversibility of a source of sound and an object on which the sound impinges. Now, the sensitive flame usually employed by me measures from...
Стр. 46 - Sound, like light, may be reflected several times in succession, and as the reflected light under these circumstances becomes gradually feebler to the eye, so the successive echoes become gradually feebler to the ear. In mountain regions this repetition and decay of sound produce wonderful and pleasing effects.
Стр. 106 - The Glaciers of the Alps" I have referred to a case of short auditory range, noticed by myself in crossing the Wengern Alps in company with a friend.
Стр. 284 - Her ivory forehead full of bounty brave, Like a broad table did itself dispread, For Love his lofty triumphs to engrave, And write the battles of his great godhead: All good and honour might therein be read; For there their dwelling was.
Стр. 423 - Behind the bony partition, and between it and the brain, we have the extraordinary organ called the labyrinth, filled with water, over the lining membrane of which are distributed the terminal fibres of the auditory nerve.
Стр. 321 - We continued our journey to the light-ship, went on board, heard the report of the lightsmen, and returned to our anchored boat. We then learned that when the flag was hoisted the horn-sounds were heard, that they were succeeded after a little time by the whistle-sounds, and that both increased in intensity as the evening advanced. On our arrival, of course we heard the sounds ourselves. We pushed the test further by steaming further out. At...