An Elementary Treatise on Natural Philosophy, المجلد 2George Kearsley, 1807 |
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عبارات ومصطلحات مألوفة
acid angle of incidence apparent magnitude appear attraction aurora borealis austral fluid axis blue bodies boreal fluid camera obscura centimetres centres of action colours concave conceive cone contrary convex copper degree diameter direction discs distance effect electricity emergent rays equal exhibit experiment extremity focus force glass globe greater horizon hypothesis incident rays inclination iron lens less Let us suppose luminous magnetic magnetised manner medium metals millimetres mirror molecule motion natural needle Newton object object-glass oblique observed Optice Lucis ordinary ray parallel particles pass pencil perpendicular phenomena philosophers pile plane plate position prism produced proportion quantity radiant point ray of aberration ray of light reflected refracted rays refrangible retina rhomboid side sine situated spectator surface take place telescope theory tion tourmalin tricity vertical violet visual angle visual ray vitreous fluid wire zinc
مقاطع مشهورة
الصفحة 230 - ... in the ratio of the sine of incidence to the sine of refraction (Art. 749,) when the light passes from water into air.
الصفحة 56 - ... application of the process to the face, the jaw of the deceased criminal began to quiver, and the adjoining muscles were horribly contorted, and one eye was actually opened. In the subsequent part of the process, the right hand was raised and clenched, and the legs and thighs set in motion. It appeared to the uninformed part of the bystanders as if the wretched man was on the eve of being restored to life. This, however, was impossible, as several of his friends who were under the scaffold had...
الصفحة 56 - On the first application of the process to the face, the jaw of the deceased criminal began to quiver ; and the adjoining muscles were horribly contorted, and one eye was actually opened. In the subsequent part of the process, -the right hand was raised and CLENCHED, and the legs and thighs were set in motion. " It appeared to the uninformed part of the by-standers, as if the wretched man was on the eve of being restored to life.
الصفحة 426 - XI- -A Treatise on Astronomy; in which the Elements of the Science are deduced in a natural Order, from the Appearances of the Heavens to an Observer on the Earth ; demonstrated on Mathematical Principles, and explained by an Application to the various Phenomena. By Olinthus Gregory, Teacher of Mathematics, Cambridge, 8vo.
الصفحة 276 - ... he before knew from feeling, he would carefully observe, that he might know them again; but having too many objects to learn at once, he forgot many of them; and (as he...
الصفحة 48 - I coated several wires in the same manner, and found that when sparks from the conductors before mentioned were made to pass through water by means of a point so guarded, a spark passing to the distance of one-eighth of an inch would decompose water, when the point exposed did not exceed T1§w of an inch in diameter. With another point...
الصفحة 56 - Galvanism to be far beyond any other stimulant in nature. On the first application of the process to the face, the jaw of the deceased criminal began to quiver, and the adjoining muscles were horribly contorted, and one eye was actually opened.
الصفحة 423 - The motions of the liquor, which is sulphuric acid tinged red with carmine, are measured by means of a graduation : the zero is situated towards the top of the branch that is terminated by the enamelled ball. The use of this instrument is founded upon the principle, that when the light is absorbed by a body, it produces a heat proportional to the quantity of absorption. When the instrument is exposed to the solar rays, those rays that are absorbed by the dark colour, heat the interior air, which...
الصفحة 48 - Having coloured a card with a strong infusion of litmus, I passed a current of electric sparks along it, by means of two fine gold points, touching it at the distance of an inch from each other. The effect, as in other cases, depending on the smallness of the quantity of water, was most discernible when the card was nearly dry. In this state a very few turns of the machine were sufficient to occasion a redness at the positive wire, very manifest to the naked eye. The negative wire, being afterward...
الصفحة 120 - ... tury, the bare fact of there being any difference whatsoever in the intensity of the magnetic force in different parts of the earth was unattested by a single published observation. The maps attached to this memoir exhibit the progress which investigation has made in the years that have since elapsed. They contain 753 distinct determinations, at 670 stations widely distributed over the earth's surface ; leaving, it is true, much...