Reprint of Papers on Electrostatics and MagnetismMacmillan, 1872 - 592 pages |
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Common terms and phrases
according aluminium angle aperture atmospheric electricity attraction axis centimetre centre charge components conductor constant corresponding denote deux diamagnetic difference of potentials direction disc distance distribution of electricity distribution of magnetism dx dy dz dxdydz earth elec electric currents electric density electric force electrical points electrified body electro-magnetic electrode electrometer electromotive force element ellipsoid equal equation equilibrium experiments expression external point ferromagnetic fluid formula given glass guard-plate Hence inductor infinitely small infinitely thin influence instrument insulated integral intensity interior l'équation Leyden jar Leyden phial lines of force magnetic force mass mathematical theory measure metal millimetre motion needle negative neighbourhood observed perpendicular plane plate polarity poles portion position produced quantity of electricity repulsion resultant force round shell solenoid solid solid angle space sphere spherical surface substance theorem Theory of Electricity tion tricity valeur wire
Popular passages
Page 19 - An Essay on the application of Mathematical Analysis to the Theories of Electricity and Magnetism...
Page 40 - Kelvin, whose undergraduate publication, you may recall, was on The uniform motion of heat in homogeneous solid bodies, and its connection with the mathematical theory of electricity...
Page 26 - If the distance between the earth and the sun is 93 million miles, and if the mass of the sun is 300,000 times that of the earth, find two positions in which a particle would be equally attracted by the earth and the sun. The gravitational attraction of one body upon another varies inversely as the square of the distance and directly as the product of the masses. Represent the mass of the earth by unity.
Page 418 - The explanation of all phenomena of electromagnetic attraction or repulsion, and of electromagnetic induction, is to be looked for simply in the inertia and pressure of the matter of which the motions constitute heat. Whether this matter is or is not electricity, whether it is a continuous fluid interpermeating the spaces between molecular nuclei, or is itself...
Page 546 - Faraday, without mathematics, divined the result of the mathematical investigation ; and, what has proved of infinite value to the mathematicians themselves, he has given them an articulate language in which to express their results. Indeed, the whole language of the magnetic field and lines of force is Faraday's. It must be said for the mathematicians that they greedily accepted it, and have ever since been most zealous in using it to the best advantage.
Page 467 - ... either or any direction. So that two portions of matter, simultaneously subject to this power, may be made to approach each other as if they were mutually attracted, or recede as if mutually repelled. All the phenomena resolve themselves into this, that a portion of such matter, when under magnetic action, tends to move from stronger to weaker places or points of force.
Page 34 - If the space round a charged globe were filled with a mixture of an insulating dielectric, as oil of turpentine or air, and small globular conductors, as shot, the latter being at a little distance from each other so as to be insulated, then these would in their condition and action exactly resemble what I consider to be the condition and action of the particles of the insulating dielectric itself.
Page 541 - By a delicate mathematical analysis, Thomson arrives at the theorem that the ''average pressure at any point of an incompressible, frictionless fluid, originally at rest, but set in motion and kept in motion by solids, moving to and fro, or whirling round in any manner, through a finite space of it," would explain the attractions just described.
Page 435 - The substance of a homogeneous solid is called isotropic when a spherical portion of it, tested by any physical agency, exhibits no difference in quality however it is turned. Or, which amounts to the same, a cubical portion cut from any position in an isotropic body exhibits the same qualities relatively to each pair of parallel faces. Or two equal and similar portions cut from any positions in the body, not subject to the condition of parallelism (§ 646), are undistinguishable from one another.
Page 204 - The electrometer twice within half an hour went above 420°, there being at the time a fresh temporary breeze from the east. What I had previously observed regarding the effect of east wind was amply confirmed. Invariably the electrometer showed very high positive in fine weather, before and during east wind. It generally rose very much shortly before a slight puff of wind from that quarter, and continued high till the breeze would begin to abate. I never once observed the electrometer going up unusually...