On the Connexion of the Physical SciencesJ. Murray, 1849 - 524 pages |
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Page 6
... extends to the moon ; and , as experience shows that the action and reaction of matter are equal and contrary ( N ... extending indefinitely in space , and including all the bodies of the system in its action . Kepler also deduced from ...
... extends to the moon ; and , as experience shows that the action and reaction of matter are equal and contrary ( N ... extending indefinitely in space , and including all the bodies of the system in its action . Kepler also deduced from ...
Page 7
... extending indefinitely in space , causing all the mutual dis- turbances which render the celestial motions so complicated , and their investigation so difficult . The gravitation of matter directed to a centre , and attract- ing ...
... extending indefinitely in space , causing all the mutual dis- turbances which render the celestial motions so complicated , and their investigation so difficult . The gravitation of matter directed to a centre , and attract- ing ...
Page 20
... extend to millions of years . That part of the disturbing force is now to be considered which acts perpendicularly to the plane of the orbit , causing periodic perturbations in latitude , secular variations in the in- . clination of the ...
... extend to millions of years . That part of the disturbing force is now to be considered which acts perpendicularly to the plane of the orbit , causing periodic perturbations in latitude , secular variations in the in- . clination of the ...
Page 31
... extends to a few centuries , it may be re- garded as an epitome of that grand cycle which will not be accomplished by the planets in myriads of ages . The revo- lutions of the satellites about Jupiter are precisely similar to those of ...
... extends to a few centuries , it may be re- garded as an epitome of that grand cycle which will not be accomplished by the planets in myriads of ages . The revo- lutions of the satellites about Jupiter are precisely similar to those of ...
Page 61
... extending to the satellites as well as the planets . Far as the earth seems to be from the sun , Uranus is no less than ... extends to the stars . Sublime as the idea is , this assumption proves ineffectual , except in a very few cases ...
... extending to the satellites as well as the planets . Far as the earth seems to be from the sun , Uranus is no less than ... extends to the stars . Sublime as the idea is , this assumption proves ineffectual , except in a very few cases ...
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Common terms and phrases
61 Cygni action appears atmosphere attraction bodies caloric cause centre centrifugal force chemical colour comet consequently copper decrease degrees density diameter diminishes direction disturbing earth ecliptic effect electric currents electricity equal equator ether excentricity extremely fluid force galvanometer glass globe gravitation greater heat hemisphere increase intensity Jupiter latitude length less light liquid longitude luminous lunar magnetic major axis mass meridian metal miles moon move nearly nebulæ nodal lines nodes NOTE nutation observed optic axis orbit oscillations parallax particles passing perigee perihelion period phenomena planets plate polarized poles position produce quantity rays reflected refraction refrangible retrograde motion revolution revolving right angles rings rotation round satellites Sir John Herschel solar spectrum solar system sound southern hemisphere space square stars substances sun's surface temperature terrestrial tion tourmaline transmitted tricity undulations Uranus vapour variation velocity vibrations Voltaic waves wire
Popular passages
Page 34 - ... accuracy — a striking proof of the power of analysis. 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 relations...
Page 2 - The heavens afford the most sublime subject of study which can be derived from science. The magnitude and splendour of the objects, the inconceivable rapidity with which they move, and the enormous distances between them, impress the mind with some notion of the energy that maintains them in their motions with a durability to which we can see no limit. Equally conspicuous is the goodness of the great First Cause, in having endowed man with faculties by which he can not only appreciate the magnificence...
Page 22 - But, in the midst of all these vicissitudes, the length of the major axes and the mean motions of the planets remain permanently independent of secular changes. They are so connected by Kepler's law, of the squares of the periodic times being proportional to the cubes of the mean distances of the planets from the sun, that one cannot vary without affecting the other.
Page 26 - That day, as other solemn days, they spent In song and dance about the sacred hill ; Mystical dance, which yonder starry sphere Of planets, and of fix'd, in all her wheels Resembles nearest, mazes intricate, Eccentric, intervolved, yet regular Then most, when most irregular they seem ; And in their motions harmony divine So smooths her charming tones, that God's own ear Listens delighted.
Page 267 - 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 18 - For it is clear, that if the motion be accelerated through a certain space, and then retarded through as much, the motion at the end of the time will be the same as if no change had taken place. But, as the orbits of the planets are ellipses, this symmetry does not hold : for, as the planet moves unequably in its orbit, it is in some positions more directly, and for a longer time, under the influence of the disturbing force than in others. And although multitudes of variations do compensate each...
Page 456 - These formulae, emblematic of Omniscience, condense into a few symbols the immutable laws of the universe. This mighty instrument of human power itself originates in the primitive constitution of the human mind, and rests upon a few fundamental axioms, which have eternally existed in Him who implanted them in the breast of man when He created him after His own image.
Page iii - If I have succeeded in my endeavour to make the laws by which the material world is governed, more familiar to my countrywomen, I shall have the gratification of thinking, that the gracious permission to dedicate my book to your Majesty has not been misplaced.
Page 2 - ... the most extraordinary conclusions have been arrived at, — is within the reach of many who shrink from the task, appalled by difficulties, which, perhaps, are not more formidable than those incident to the study of the elements of every branch of knowledge.
Page 461 - If a right cone with a circular base be cut at right angles to the base by a plane passing through the apex, the section will be a triangle. If the cone be cut through both sides by a plane parallel to the base, the section will be a circle.