Other editions - View all
according acid acting action amount angle appears assumed atoms attraction axis becomes body cause centre chloride colour combined Communicated compound conducting considered consists constant containing continuous copper corresponding density described determined direction distance effect electricity equal equation experiments expressed fact fluid force formula function give given glass greater heat Hence inch increase indicated iron less light lines liquid magnetic manner matter means medium mercury metals method motion move nature nearly observed obtained particles pass phenomena physical plane plate polarization poles portion position present pressure produced quantity question rays referred relation remains represent resistance respect rotation salt separated side similar solution streams substance supposed surface Table temperature theory tion tube values varies velocity vortices weight wire
Page 203 - Col. 1 Col. 2 Col. 3 Col. 4 Col. 5 Col. 6 Col. 7 Col. 8 Col. 9 Col. 10 Col.
Page 281 - ... a layer of particles, revolving each on its own axis in the opposite direction to that of the vortices, so that the contiguous surfaces of the particles and of the vortices have the same motion. In mechanism, when two wheels are intended to revolve in the same direction, a wheel is placed between them so as to be in gear with both, and this wheel is called an "idle wheel.
Page 316 - the theory of the transitory changes is in itself one of the most interesting and important points to which the attention of magnetic inquirers can be turned, as they are no doubt intimately connected with the general causes of terrestrial magnetism, and will probably lead us to a much more perfect knowledge of these causes than we now possess.
Page 86 - On the Existence of a Fourth Member of the Calcium Group of Metals', Phil. Mag. 21, 86-8 (1861), reprinted Chem.
Page 527 - It is desirable that the evidence of further experiments with such plants, under conditions of more healthy growth, should be obtained. Results obtained with some other plants, are in the same sense as those with Graminaceous and Leguminous ones, in regard to the question of the assimilation of free nitrogen. In view of the evidence afforded of the non-assimilation of free nitrogen by plants, it is very desirable that the several actual or possible sources whence they may derive combined nitrogen...
Page 44 - The encouragement I derive from this appreciation by mathematicians of the mode of figuring to one's self the magnetic forces by lines, emboldens me to dwell a little more upon the further point of the true but unknown natural magnetic action. Indeed, what we really want, is not a variety of different methods of representing the forces., but the one true physical signification of that which is rendered apparent to us by the phenomena, and the laws governing them.
Page 229 - ... consequence, the column in the globe stem rose, and that in the outer tube fell, the difference of level forming a measure of the expansion of the steam. Observations of the levels of the columns were made by means of a cathetometer at different temperatures, up to 10° or 20° above the saturation point ; and the maximum temperature of saturation was, for reasons developed by the experiments, deduced from, a point at which the steam was decidedly superheated. The results of the experiments,...
Page 64 - Torpedo, and probably of every other electric fish, there is a continual circulation of electricity in the liquid medium in which the animal is immersed. In fact, when the electric organ, or even a fragment of it, is removed from the living fish and placed between the ends of a galvanometer, the needle remains deflected at a constant angle for twenty or thirty hours, or even longer.
Page 152 - ... referred to formed the necessary basis of his discovery ; so did the laws of Kepler furnish to Newton the basis of the theory of gravitation. But what Kirchhoff has done carries us far beyond all that had before been accomplished. He has introduced the order of law amid a vast assemblage of empirical observations, and has ennobled our previous knowledge by showing its relationship to some of the most sublime of natural phenomena.
Page 534 - This paper gave the geological results of three years' exploration of the British Territories in North America along the frontier-line of the United States, and westward from Lake Superior, to the Pacific Ocean. - It began by showing that the central portion of North America is a great triangular plateau, bounded by the Rocky Mountains, Alleghanies, and Laurentian axis, stretching from Canada to the Arctic Ocean, and divided into two slopes by a watershed that nearly follows the political boundary-line,...