On the Connection of the Physical SciencesHarper & brothers, 1846 - 460 pages |
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Page 22
... appears that there exists an invariable plane ( N. 80 ) , passing through the center of gravity of the system , about which the whole oscillates within very narrow limits , and that this plane will always remain parallel to itself ...
... appears that there exists an invariable plane ( N. 80 ) , passing through the center of gravity of the system , about which the whole oscillates within very narrow limits , and that this plane will always remain parallel to itself ...
Page 28
... . It appears from observation that the mean motion of the first satellite , plus twice that of the third , is equal to three times that of the second ; and that the mean 28 PERTURBATIONS OF THE SATELLITES . SECT . IV .
... . It appears from observation that the mean motion of the first satellite , plus twice that of the third , is equal to three times that of the second ; and that the mean 28 PERTURBATIONS OF THE SATELLITES . SECT . IV .
Page 30
... appear to be situated in the direction of the rays which proceed from them . Were light propagated instantaneously , every object , whether at rest or in mo- tion , would appear in the direction of these rays ; but as light takes some ...
... appear to be situated in the direction of the rays which proceed from them . Were light propagated instantaneously , every object , whether at rest or in mo- tion , would appear in the direction of these rays ; but as light takes some ...
Page 37
... appears , from theory as well as observation , that both these elements are subject to a secular inequality , arising from the variation in the eccentricity of the earth's orbit , which connects them with the Acceleration , so that both ...
... appears , from theory as well as observation , that both these elements are subject to a secular inequality , arising from the variation in the eccentricity of the earth's orbit , which connects them with the Acceleration , so that both ...
Page 42
... appears that the sun's mean distance from the earth is 396 , or nearly 400 times greater than that of the moon . The method of finding the absolute distances of the celestial bodies in miles , is in fact the same with that employed in ...
... appears that the sun's mean distance from the earth is 396 , or nearly 400 times greater than that of the moon . The method of finding the absolute distances of the celestial bodies in miles , is in fact the same with that employed in ...
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Common terms and phrases
action appears atmosphere attraction bodies caloric cause centrifugal force chemical color comet computed consequently crystal degree density diameter diminishes direction disturbing earth ecliptic effect electricity equal equator ether extremely fluid galvanometer glass globe gravitation greater heat increase inequalities intensity Jupiter Jupiter's latitude length less light liquid longitude luminous lunar magnetic major axis mass mean distance mean motion meridian metal miles moon move nearly nodal lines nodes NOTE nutation observations ocean optic axis orbit oscillations parallax particles passing perigee perihelion periodic phenomena planet plate polarized poles position produce quantity rays reflected refraction refrangible retrograde motion revolution revolving right angles rings rotation satellites secular secular variation Sir John Herschel Sir William Herschel solar spectrum sound space square stars substances sun's surface temperature terrestrial theory tion tourmaline transmitted tricity undulations variation velocity vibrations Voltaic waves wire
Popular passages
Page 374 - a thousand years are as one day, and one day as a thousand years.
Page 381 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Page 21 - A singular law obtains among the mean motions and mean longitudes of the first three satellites. It appears from observation that the mean motion of the first satellite, plus twice that of the third, is equal to three times that of the second ; and that the mean longitude of the first satellite, minus three times that of the second, plus twice that of the third, is always equal to two right angles. It is proved by theory, that if these...
Page 407 - Whatever the reflecting surface may be, and however obliquely the light may fall upon it, the angle of reflection is always equal to the angle of incidence. Thus...
Page 282 - The spark taken in the same manner from zinc, cadmium, tin, bismuth, and lead, in the melted state, gives similar results ; but the number, position, and colours of the lines vary in each case. The appearances are so different that, by this mode of examination, the metals may be readily distinguished from each other.
Page 349 - Swan, which, after becoming invisible, reappeared, and having undergone many variations in light, vanished after two years, and has never since been seen. In 1572 a star was discovered in Cassiopeia, which rapidly increased in brightness till it even surpassed that of Jupiter ; it then gradually diminished in splendor, and having exhibited all the variety of tints that indicate the changes of combustion, vanished sixteen months after its discovery, without altering its position. It is impossible...
Page 78 - about 30° eastward of the moon, where it is always high water both in the hemisphere where the moon is and in that which is opposite. On the west side of this circle the tide is flowing, on the east it is ebbing, and on every part of the meridian at 90° distant it is low water.
Page 368 - ... of volcanic eruption. It has even been computed, that if a stone were projected from the moon in a vertical line, with an initial velocity of 10,992 feet in a second, — more than four times the velocity of a ball when first discharged from a cannon, — instead of falling back to the moon by the attraction of gravity, it would come within the sphere of the earth's attraction, and revolve about it like a satellite. These bodies, impelled either by the direction of the primitive impulse, or by...
Page 221 - John thence concludes — 1st. That it is the heat of these rays, not their light, which operates the change ; 2ndly. That this heat possesses a peculiar chemical quality which is not possessed by the purely calorific rays outside of the visible spectrum, though far more intense ; and, 3rdly. That the heat radiated from obscurely hot iron, abounds especially in rays analogous to those of the region of the spectrum above indicated.
Page 274 - ... were distinctly visible. Day broke very slowly, and the sun rose of a fiery and threatening aspect. Rain followed. Captain Bonnycastle caused a bucket of this fiery water to be drawn up ; it was one mass of light when stirred by the hand, and not in sparks as usual, but in actual coruscations.