The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science

Framhliđ kápu
Taylor & Francis, 1855
 

Efni


Ađrar útgáfur - View all

Common terms and phrases

Vinsćlir kaflar

Síđa 85 - That gravity should be innate, inherent, and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity that I believe no man who has in philosophical matters a competent faculty of thinking can ever fall into it. Gravity must be caused by an agent acting constantly according to certain laws, but whether this agent...
Síđa 39 - ... and potential energy, of the disturbance in a certain space traversed by it ; and from all we know of the mechanical theory of undulations, it seems certain that this velocity must be a very small fraction of the velocity of propagation in the most intense light or radiant heat which is propagated according to known laws. Denoting this velocity for the case of sunlight at the earth's distance from the sun by v, and calling W the mass in...
Síđa 154 - A similar appliance to the last-mentioned for the use of needlewomen. For this purpose screens are to be provided, both of green and of blue gelatine paper ; so that the white materials employed in needlework may be changed to a pleasant green, by the screen of that colour, the yellow materials to a green by the blue screen, and by one or other of these screens the reds softened down into violets or browns. 4. For either of the two last purposes on a larger scale, the gelatine paper may be attached...
Síđa 113 - I have no clear idea of the physical condition constituting the charged magnetic state; ie the state of the source of magnetic power: — or of the coercitivity by which that state is either resisted in its attainment, or sustained in its permanent condition ; for the hypotheses as yet put forth give no satisfaction to my mind. I profess rather to point out the difficulties in the way of the views, which are at present somewhat too easily accepted, and to shake men's minds from their habitual trust...
Síđa 85 - That gravity should be innate, inherent and essential to matter, so that one body may act upon another at a distance through a vacuum without the mediation of anything else, by and through which their action and force may be conveyed from one to the other, is to me so great an absurdity, that I believe no man who- has in philosophical matters a competent faculty of thinking, can ever fall into it.
Síđa 150 - SIR, — I have the honour to state, for the information of the Royal Society, that a new asteroid was discovered here by Mr.
Síđa 160 - ... has no reference to the subject of our inquiries. " It will be seen by the third line, that about two-thirds of a second elapsed in every case before the current became apparent at the distance of 768 miles, indicating a velocity of about 1000 miles a second ; but the most interesting part appears to be, that this velocity is sensibly uniform for all intensities from 31 cells to 500.
Síđa 38 - Recurring, however, to the definite expression for the mechanical value of the disturbance in the case of homogeneous circularly-polarized light, the only case in which the velocities of all particles are constant and the same, we may define the mean velocity of vibration in any case as such a velocity that the product of its square into the mass of the vibrating particles is equal to the whole mechanical value, in actual and potential energy, of the disturb.
Síđa 37 - Now the whole mechanical value of homogeneous plane polarized light in an infinitely small space containing only particles sensibly in the same phase of vibration, which consists entirely of potential energy at the instants when the particles are at rest at the extremities of their excursions, partly of potential and partly of...
Síđa 519 - The total intrinsic energy of a body might be defined as the mechanical value of all the effect it would produce, in heat emitted and in resistances overcome, if it were cooled to the utmost, and allowed to contract indefinitely or to expand indefinitely according as the forces between its particles are attractive or repulsive, when the thermal motions within it are all stopped ; but in our present state of ignorance regarding perfect cold, and the nature of molecular forces, we cannot determine...

Bókfrćđilegar upplýsingar