Elements of Natural Philosophy ...Harper & brothers, 1850 - 405 من الصفحات |
المحتوى
| 13 | |
| 19 | |
| 41 | |
| 56 | |
| 80 | |
| 95 | |
| 119 | |
| 121 | |
| 225 | |
| 236 | |
| 247 | |
| 249 | |
| 252 | |
| 258 | |
| 259 | |
| 260 | |
| 122 | |
| 127 | |
| 129 | |
| 133 | |
| 137 | |
| 138 | |
| 142 | |
| 143 | |
| 145 | |
| 146 | |
| 148 | |
| 151 | |
| 155 | |
| 156 | |
| 157 | |
| 160 | |
| 163 | |
| 169 | |
| 173 | |
| 176 | |
| 178 | |
| 180 | |
| 182 | |
| 183 | |
| 184 | |
| 186 | |
| 205 | |
| 262 | |
| 263 | |
| 264 | |
| 271 | |
| 272 | |
| 277 | |
| 286 | |
| 290 | |
| 291 | |
| 293 | |
| 299 | |
| 303 | |
| 304 | |
| 307 | |
| 310 | |
| 313 | |
| 316 | |
| 317 | |
| 320 | |
| 322 | |
| 323 | |
| 334 | |
| 344 | |
| 371 | |
| 384 | |
| 400 | |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
air-waves angle angle of incidence aperture atmosphere atoms attraction axis axle ball battery body called caloric cause center of gravity colors concave condensed conductor connected convex convex lens currents density Describe determined diminish direction distance earth effect elastic electricity electrified equal equilibrium exerted fall feet per second flow fluids force friction gases glass heat hence Illustrate inches inclined plane increase index of refraction inertia inversely lens lenses lever Leyden jar liquid magnetic mercury miles miles per hour mirror motion move Muslin Natural Philosophy number of vibrations object opposite parallel particles pass pendulum piston placed plate polarity pole pressure prism produced quantity of matter rays of light refraction rise Sheep extra side solid sound space specific gravity square steam string substances surface temperature tion tricity tube undulations velocity vessel voltaic wave length weight wheel wire zinc
مقاطع مشهورة
الصفحة 258 - Other combustibles ; it consumes none while idle ; it never tires, and wants no sleep ; it is not subject to malady when originally well made, and only refuses to work when worn out with age ; it is equally active in all climates, and will do work of any kind ; it is a water-pumper, a miner, a sailor, a cottonspinner, a weaver, a blacksmith, a miller, &c.
الصفحة 118 - Mechanics is, in the most pre-eminent sense, a scientific art; and it may be truly asserted, that almost all the great combinations of modern mechanism, and many of its refinements and nicer improvements, are creations of pure intellect, grounding its exertion upon a moderate number of very elementary propositions in theoretical mechanics and geometry.
الصفحة 258 - ... horses, it is obedient to the hand of a child. Its aliment is coal, wood, charcoal, or other combustible ; it consumes none while idle; it never tires, and wants no sleep ; it is not subject to malady when originally well made ; and only refuses to work when worn out with age ; it is equally active in all climates, and will do work of any kind ; it is a water-pumper...
الصفحة 118 - ... in exchange for its peculiar commodities ; and to concentrate around us, in our dwellings, apparel and utensils, the skill and workmanship, not of a few expert individuals, but of all who, in the present and past generations, have contributed their improvements to the processes of our manufactures.
الصفحة 325 - ... nay, from every point in every object, and at every moment of time, a messenger of light to tell him what is there, and in what condition. Were he omnipresent, or had he the power of flitting from place to place with the speed of the wind, he could...
الصفحة 292 - That sagacious electrician employs the following language : "In the long-continued course of experimental inquiry, in which I have been engaged, this general result has pressed upon me constantly — namely, the necessity of admitting two forces or directions of force, combined with the impossibility of separating these two forces or electricities from each other.
الصفحة 257 - In the present perfect state of the engine it appears a thing almost endowed with intelligence. It regulates with perfect accuracy and uniformity the number of its strokes in a given time, counting or recording them, moreover, to tell how much work it has done, as a clock records the beats of its pendulum ; it regulates the quantity of steam admitted to work; the briskness of the fire; the supply of water to the boiler ; the supply of coals to the fire ; it opens and shuts its valves with absolute...
الصفحة 82 - There are three kinds of lever according to the respective positions of the power, the weight, and the fulcrum. In the first, the fulcrum is between the power and the weight.