A System of Mechanical Philosophy, Հատոր 3J. Murray, 1822 - 50 էջ |
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aberration achromatic action angle appears arch astronomers atmosphere axis barometer barrel body centre chromatic dispersion circle cock colours column compressed construction cylinder deflection degree density diameter diminished direction dispersion disturbing force Dr Hooke Earth ecliptic elasticity elevation ellipse epicycle equal equator experiments eye-glass feet fluid focal distance focus give glass gravitation greater height high water hole inches increase inversely Jupiter lens lunar manner matter means measure mercury Moon Moon's motion move natural density nearly Newton nodes object-glass observed orbit parallel particle perigee perpendicular phenomena philosophers pipe piston planet pole precisely pressure produced proportion pump quadrature quantity radius rarefaction ratio rays receiver reflecting telescopes refraction rotation Saturn screw sensible shew side sine Sir Isaac Newton sphere spherical spherical aberration spheroid square stars stratum Sun's suppose surface syringe syzigy telescope temperature tide tion tube undulations valve velocity vessel whole
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Էջ 94 - He went home, took out his old papers, and resumed his calculations. As they drew near to a close, he was so much agitated that he was obliged to desire a friend to finish them.
Էջ 683 - A gas rushes into a vacuum with the velocity which a heavy body would acquire by falling from the height of an atmosphere composed of the gas in question, and supposed to be of uniform density throughout. The height of the uniform atmosphere will be inversely as the specific gravity of the gas, the atmosphere of hydrogen, for instance, sixteen times higher than that of oxygen.
Էջ 523 - C, suspended at the end of it, with his back towards the object he views. There is no small speculum, but the magnifiers are applied immediately to the first focal image. From the opening of the telescope, near the place of the eye-glass, a speaking pipe runs down to the bottom of the tube, where it...
Էջ 75 - ... between the squares of the periodic times and the cubes of the distances. The...
Էջ 788 - Q be opened, the water and air rush out together with prodigious violence, and the drops of water are changed into hail or lumps of ice. It is a sight usually shown to strangers, who are desired to hold their hats to receive the blasts of air : the ice comes out with such violence as frequently to pierce the hat like a pistol bullet.
Էջ 678 - Multiply the difference d between 32° and the mean temperature of the air by -21, and take the sum or difference of this product and 87 feet. This is the height through which we must rise to cause the barometer to fall from 30 inches to 29'9 ; and may be called h. III. Let m be the mean between the two barometric heights : Then '— is the approximated elevation very nearly.
Էջ 529 - This appears from the following facts : 1. It always accompanies this globe in its orbit round the sun, surrounding it to a certain distance, under the name of the ATMOSPHERE, which indicates the being connected with the earth by its general force of gravity. It is chiefly in consequence of this that it is continually moving round the earth from east to west ; forming what is called the trade-wind, to be more particularly considered afterwards.
Էջ 523 - ... and thus the communications of the observer are conveyed to the assistant in the observatory, and the workman is directed to perform the required motions. The foundation of the apparatus, by which the telescope is suspended and moved, consists of two concentric circular brick walls, the outermost of which is twenty-two feet in diameter, and the inside one twenty-one feet.
Էջ 528 - An; ; and when it is in motion we call it WIND. Air, therefore, is a material fluid : a fluid, because its parts are easily moved, and yield to the smallest inequality of pressure. Air possesses some others of the very general, though not essential, properties of matter. It is heavy. This appears from the following facts : 1.
Էջ 301 - The sustaining hand of God is still necessary, and the present order and harmony which he has enabled us to understand and to admire, is wholly dependent on his will, and its duration is one of the unsearchable measures of his providence.