The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1865 |
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Altres edicions - Mostra-ho tot
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1904 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1894 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1901 |
Frases i termes més freqüents
action æther alcohol ammonia angle antisolar point appears atmosphere axis bismuth body carbonate carbonic acid centre cerium charge chemical chloride coefficients colour compound condensation conductor constant contained copper cos² crystals curve density determined diameter discharge disk dissolved distance effect elastic force electric electromotive force electroscope equal equation erbia experiments flame formula galvanometer given glass gravity heat Hence hydrochloric acid hydrogen inches increase induction intensity iron light lines liquid acid lithium magnetic means measure mercury metal metre millims molecules motion neutral point nitric acid observed obtained oxide paper particles phenomena Phil Philosophical Magazine plane plate platinum polarization position produced Prof quantity radiation rays resistance salts side sin² soluble solution specific gravity spectrum substance sulphur sulphuric acid supposed surface temperature thallium tion tube Tyndall unit vapour velocity wire yttria zinc
Passatges populars
Pàgina 278 - for ascertaining and applying " the deviations of the compass caused by the iron in a ship.
Pàgina 56 - ... its application to mechanics*. The actio agentis, as he defines it, which is evidently equivalent to the product of the effective component of the force, into the velocity of the point on which it acts, is simply, in modern English phraseology, the rate at which the agent works. The subject for measurement here is precisely the same as that for which Watt, Horse- a hundred years later, introduced the practical unit of a "Horsepower...
Pàgina 180 - THERE is not, perhaps, another object in the heavens that presents us with such a variety of extraordinary phenomena as the planet Saturn. A magnificent globe, encompassed by a stupendous double ring, attended by seven satellites, ornamented with equatorial belts, compressed at the poles; turning...
Pàgina 466 - The potential, at any point in the neighbourhood of or within an electrified body, is the quantity of work that would be required to bring a unit of positive electricity from an infinite distance to that point, if the given distribution of electricity remained unaltered.
Pàgina 76 - Dawsoii carefully examined the laminated material, and he found it to consist of the remains of an organism which grew in large sessile patches, increasing at the surface by the addition of successive layers of chambers separated by calcareous laminae. Slices examined microscopically showed large irregular chambers with numerous rounded extensions, and bounded by walls of variable thickness, which are studded with septal orifices irregularly disposed ; the thicker parts of the walls revealed the...
Pàgina 156 - With regard to normal vibrations, the electromagnetic theory does not allow of their transmission. What, then, is light according to the electromagnetic theory ? It consists of alternate and opposite rapidly recurring transverse magnetic disturbances, accompanied with electric displacements, the direction of the electric displacement being at right angles to the magnetic disturbance, and both at right angles to the direction of the ray.
Pàgina 241 - The instruments made use of were the electric lamp of Duboscq and the linear thermo-electric pile of Melloni. The spectrum was formed by means of lenses and prisms of pure rock-salt. It was equal in width to the length of the row of elements forming the pile, and the latter being caused to pass through its various...
Pàgina 320 - US, is evidently perceived to conRR sist of clustering stars. There can therefore be little doubt as to the whole consisting of stars, too minute to be discerned individually even with these powerful aids, but which become visible as points of light when closely adjacent in the more crowded parts...
Pàgina 346 - ... augmented very slowly in size. This is perhaps the best method of obtaining beautifully formed crystals of ice. While, therefore, the outer ice which had to support the pressure of the atmosphere slowly melted, the water within the flask, whose freezing-point, on account of a defect of pressure, was 0-0075° C. higher, deposited crystals of ice. The heat abstracted from the water in this operation had, moreover, to pass through the glass of the flask, which, together with the small difference...
Pàgina 242 - ... to cut off the light of the mid-day sun was, within the limits of experiment, absolutely transparent to invisible radiant heat. This then is the substance by which the invisible rays of the electric light may be almost perfectly detached from the visible ones. Concentrating by a small glass mirror, silvered in front, the rays emitted by the carbon points of the electric lamp, we obtain a convergent cone of light. Interposing in the path of this concentrated beam a cell containing the opaque solution...