The Laws of Gravitation: Memoirs by Newton, Bouguer and Cavendish, Together with Abstracts of Other Important MemoirsAmerican book Company, 1900 - 160 من الصفحات |
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عبارات ومصطلحات مألوفة
Airy Airy's altitudes apparatus Arthur's Seat Baily Baily's balance ball Bertier bodies Bouguer calculated Cavendish Cavendish experiment centre centrifugal force Cetus Cornu and Baille corrections deflection determine diameter difference distance Divisions Time Point draw the arm earth effect equal error experiments Extreme points Divisions Fresdorf globe gravitation constant HENRY CAVENDISH hill Hutton inches Journ Jupiter la Condamine latitude length Lond magnetic Maskelyne mean density ment Meridian Altitudes method middle point midway position moment of inertia Motion of arm mountain moved to negative moved to positive moving the weights negative position observations pendulum Peru Phys Pichincha PIERRE BOUGUER placed planets plumb-line Point of rest position Extreme points positive position Poynting 185 proportion quantity of matter Quito radius ratio Reich Rozier Saigey Schehallien sea-level seconds-pendulum specific gravity sphere spherical Sterneck surface suspended temperature tion toises torsion torsion balance ulum vibration Weights moved wire
مقاطع مشهورة
الصفحة 16 - Whence a sphere of one foot in diameter, and of a like nature to the earth, would attract a small body placed near its surface with a force 20000000 times less than the earth would do if placed near its surface; but so small a force could produce no sensible effect. If two such spheres were distant but by...
الصفحة 14 - Since, therefore, the common matter of our earth on the surface thereof is about twice as heavy as water, and a little lower, in mines, is found about three, or four, or even five times more heavy, it is probable that the quantity of the whole matter of the earth may be five or six times greater than if it consisted all of water; especially since I have before shewed that the earth is about four times more dense than Jupiter.
الصفحة 11 - Jupiter from the sun by one 1-2000 part of the whole distance — that is, by a fifth part of the distance of the utmost satellite from the centre of Jupiter ; an eccentricity of the orbit which would be very sensible. But the orbits of the...
الصفحة 11 - The boxes hanging by equal threads of eleven feet, made a couple of pendulums perfectly equal in weight and figure, and equally receiving the resistance of the air. And placing the one by the other, I observed them to play together forwards and backwards, for a long time, with equal vibrations.
الصفحة 11 - If, at equal distances from the sun, any satellite, in proportion to the quantity of its matter, did gravitate towards the sun with a force greater than Jupiter in proportion to his, according to any given proportion, suppose of...
الصفحة 15 - It is true that we may regard one body as attracting, another as attracted; but this distinction is more mathematical than natural. The attraction is really common of either to other, and therefore of the same kind in both.
الصفحة 61 - I resolved to place the apparatus in a room which should remain constantly shut, and to observe the motion of the arm from without, by means of a telescope; and to suspend the leaden weights in such a manner, that I could move them without entering into the room. This difference in the manner of observing, rendered it necessary to make some alteration in Mr.
الصفحة 12 - The power of gravity is of a different nature from the power of magnetism ; for the magnetic attraction is not as the matter attracted. Some bodies are attracted more by the magnet ; others less ; most bodies not at all. The power of magnetism in one and the same body may be increased and diminished ; and is sometimes far stronger, for the quantity of matter...
الصفحة 12 - ... above. COR. 1 . Hence the weights of bodies do not depend upon their forms and textures; for if the weights could be altered with the forms, they would be greater or less, according to the variety of forms, in equal matter; altogether against experience, COR.
الصفحة 100 - It, indeed, may be objected, that as the result appears to be influenced by the current of air, or some other cause, the laws of which we are not well acquainted with, this cause may perhaps act always, or commonly, in the same direction, and thereby make a considerable error in the result. But yet, as the experiments were tried in various weathers, and with considerable variety in the difference of temperature of the weights and air, and with the arm resting at different distances from the sides...