Philosophical MagazineTaylor & Francis, 1844 |
Other editions - View all
Common terms and phrases
action æther alcohol ammonia analysis angle appears atoms battery beds blue boiling calm SW carbonic acid cells cent centre chemical chloric acid chloride clay Cloudy colour comet compound containing copper cos² crystals cyanide cyanide of potassium cyanol decomposed decomposition deposited dissolved distilled double salt effect electricity electrolysis equation equivalent experiments fluorine formula fossils gases gold grains greensand heat hydrochloric acid hydrogen inches leucol light lime limestone liquid magnesia matter means metallic mixture narcotine nitric acid nitrogen observed obtained ovum oxide oxygen paper phænomena Phil phosphate plane plants plate platinode platinum portion potash potassium precipitate produced Prof protoxide quantity quaternions rain rays remarkable rocks salt sandstone Sandwick silver sin² soda soluble solution species strata substance sulphate sulphuric acid surface synthemes temperature tion tithonic tube voltaic wire yellow zinc zincode
Popular passages
Page 144 - A piece of potassium contains less potassium than an equal piece of' the potash formed by it and oxygen. We may cast into potassium oxygen atom for atom, and then again both oxygen and hydrogen in a twofold number of atoms, and yet, with all these additions, the matter shall become less and less, until it is not two--thirds of its original volume. If...
Page 92 - After ten days, under the blue fluid there was a crop of cress, of as bright a green as any which grew in full light, and far more abundant.
Page 145 - Now the force or energy of the wave, which, expressed with reference to sensation, means the intensity of the light, is proportional to the square of the amplitude. Hence the amplitude being one-hundredfold, the energy of the largest light-giving waves would be ten-thousandfold that of the smallest.
Page 145 - Next take the case of a metal, platinum or potassium, constituted, according to the atomic theory, in the same manner. The metal is a conductor; but how can this be, except space be a conductor ? for it is the only continuous part of the metal, and the atoms not only do not touch (by the theory), but as we shall see presently, must be assumed to be a considerable way apart. Space therefore must be a conductor, or else the metals could not conduct, but would be in the situation of the black sealing...
Page 147 - If we must assume at all, as indeed in a branch of knowledge like the present we can hardly help it, then the safest course appears to be to assume as little as possible; and in that respect the atoms of Boscovich appear to me to have a great advantage over the more usual notion.
Page 89 - The distinguishing feature of the new theory was, that the particles of one gas are not elastic or repulsive in regard to the particles of another gas, but only to the particles of their own kind.
Page 130 - When an equivalent of one and the same metal replaces another in a solution of any of its salts of the same order, the heat developed is always the same ; but a change in either of the metals produces a different development of heat.
Page 341 - As soon as the paper is wetted with the gallo-nitrate, it ought instantly to be removed into a dish of water; five or ten seconds at the most is as long as it is safe at this stage to leave the paper to be acted upon by the gallo-nitrate; in that space of time it absorbs sufficient to render it exquisitely sensitive. The excess of gallo-nitrate must immediately be washed off by drawing the paper gently several times under the surface of water, which must be perfectly clean ; and being thus washed,...
Page 340 - Pour the solution into a shallow flat-bottomed dish, sufficiently large to admit the paper, and let the bottom of the vessel be covered to the depth of an eighth of an inch. The prepared side of the paper, having been previously marked, is to be brought in contact with the surface of the solution, and, as it is desirable to keep the other side clean and dry, it will be found convenient, before putting it in the iodine, to fold upwards a narrow margin along the two opposite edges.
Page 538 - ... gave the leaves a yellowish or orange tinge, but they were still to be made green. For this purpose some lumps of a fine blue were produced, together with a white substance in powder, which, from the names given to them by the workmen, as well as their appearance, were known at once to be Prussian blue and gypsum.