Mathematical and Physical Papers, Količina 2University Press, 1884 |
Druge izdaje - Prikaži vse
Pogosti izrazi in povedi
amount applied Augmentation of difference battery brass cable cells Cent centims circuit copper slip copper wire critical value current entering curves deflection diagram dimensions diminished diminution direction distance dynamical earth electric conductivity electric currents electro-magnetic electrodes electromotive force entering by end equal equation experiments galvanometer greater gutta-percha half heat inch indicated induction insulated iron wire Joule junctions length lines longitudinal magnetization magnetizing current magnetizing force magnetometer mass mechanical value metals meteors miles minute of current motion nautical miles nearly needle neutral point nickel observed P₁ periods piece platinum position potential energy produced residual magnetism resistance reverse round Royal Society scale side slips soft iron solar soldered specimens steel stress submarine Sun's surface telegraph temperature testing conductor theory thermal thermo thermo-electric effect thermo-electric quality thermometers tion transverse tube velocity vertical weight zero zinc
Priljubljeni odlomki
Stran 192 - On the Calorific Effects of Magneto-Electricity, and on the Mechanical Value of Heat," communicated to the British Association (Cork), Aug. 1843, and published Phil. Mag. Oct. 1843. "On the Intermittent Character of the Voltaic Current in certain cases of
Stran 189 - which the temperature of a small quantity of water, contained in a shallow circular case provided with vanes in its top and bottom, and violently agitated by a circular disc provided with similar vanes, and made to turn rapidly round, could easily be raised in temperature several degrees in a few minutes by the
Stran 190 - foot pounds of work, (that is 772 times the amount of work required to overcome a force equal to the weight of 1 lb. through a space of 1 foot,) is required to generate as much heat as will raise the temperature of a pound of water by one degree.
Stran 40 - give us heat and light which has been got from the sun a few years ago. Our coal fires and gas lamps bring out for our present comfort heat and light of a primeval sun which have lain dormant as potential energy beneath seas and mountains for countless ages. We must
Stran 191 - while heat is taken in by the material arrangement or machine, from the source of heat, heat is always given out in another locality, which is at a lower temperature than the locality at which heat is taken in. But it was remarked that the quantity of heat given out is not, (as
Stran 14 - fuel. If then the Sun be a burning mass, it must be more analogous to burning gunpowder than to a fire burning in air; and it is quite conceivable that a solid mass, containing within itself all the elements required for combustion, provided the products of combustion are
Stran 31 - be the immediate cause of solar heat; and the velocity with which these vapours circulate round equatorial parts of the Sun must amount to 435 kilometres per second. The spectrum test of velocity applied by Lockyer showed but a twentieth part of this amount as the greatest observed relative velocity between different vapours in the Sun's atmosphere.
Stran 29 - The old nebular hypothesis supposes the solar system, and other similar systems through the universe which we see at a distance as stars, to have originated in the condensation of fiery nebulous matter. This hypothesis was invented before the discovery of thermo-dynamics, or the nebulae would not have been supposed to be fiery; and the idea seems never to have occurred
Stran 71 - We may be sure beforehand that the American telegraph will succeed, with a battery sufficient to give a sensible current at the remote end, when kept long enough in action; but the time required for each deflection will be sixteen times as long as would be with a wire a quarter of the length,
Stran 117 - of an inch in diameter, covered with gutta-percha to a diameter of a quarter of an inch, would, with the same electrical power, and the same instruments, do more telegraphic work than one constructed with copper wire of the quality D, of ^ of