What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 11
... pressure would be an unalterable standard of time , and that the wave length in vacuum of sodium light would form a standard of length independent of any change in the force of gravitation and in the di- mensions of the earth . Maxwell ...
... pressure would be an unalterable standard of time , and that the wave length in vacuum of sodium light would form a standard of length independent of any change in the force of gravitation and in the di- mensions of the earth . Maxwell ...
Pagina 21
... pressure is least when the average energy of motion is greatest . The wave motion is greatest near the fork and the pressure there is least , and the suspended body is therefore urged toward the fork . Maxwell remarks that all the ...
... pressure is least when the average energy of motion is greatest . The wave motion is greatest near the fork and the pressure there is least , and the suspended body is therefore urged toward the fork . Maxwell remarks that all the ...
Pagina 41
... pressure in all directions at right angles to the lines of force , the tension and the pressure being equal in numerical value and proportional to the square of the intensity of the field at the given point , the observed electrostatic ...
... pressure in all directions at right angles to the lines of force , the tension and the pressure being equal in numerical value and proportional to the square of the intensity of the field at the given point , the observed electrostatic ...
Pagina 42
... pressure in the direction of the lines of force , combined with a tension in all directions at right angles to the lines of force . Such a stress would no doubt account for the observed effects of gravita- tion . " A B FIG . 4 . Prof ...
... pressure in the direction of the lines of force , combined with a tension in all directions at right angles to the lines of force . Such a stress would no doubt account for the observed effects of gravita- tion . " A B FIG . 4 . Prof ...
Pagina 46
... pressure . Cut a copper wire carrying an electrical current , file the ends square , place a sheet of writing paper between the ends and press them together : the current which was transmitting thousands of horse power is stopped ; it ...
... pressure . Cut a copper wire carrying an electrical current , file the ends square , place a sheet of writing paper between the ends and press them together : the current which was transmitting thousands of horse power is stopped ; it ...
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Termeni și expresii frecvente
action alternating current apparatus attraction body carbon cathode rays centimetres charged circuit coil of wire conductor connected copper copper wire Crookes tube current of electricity detect direction discharge distance dynamo dynamo machine earth effect elec electric current electric spark electric waves electrical energy electrical machine electro-magnetic electro-magnetic waves electro-motive force employed ether excited experiments Faraday flow fluid galvanometer glass gravitation horse power Illustrations inch insulated iron J. J. Thomson lamp Leyden jar lines of force lines of magnetic magnetic force manifestations means measure medium metals method mirror molecular molecules motor movement needle obtained ordinary oscillations oxygen pass phenomena phenomenon photograph pipes placed plate polarization pressure produced Prof refraction resistance revolving Ruhmkorff coil self-induction south pole space spark gap spool steam engine storage battery suitable telephone terminals theory tion to-and-fro currents transformations of energy transmitted tricity tube velocity vibrations voltaic cell zinc
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Pagina 314 - SOUND : a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the use of Students of every age.
Pagina 296 - ... of our planet, so far as we know it; and nitrogen is very far the predominant constituent of our atmosphere. If the earth is a detached bit whirled off the mass of the sun, as cosmogonists love to tell us, how comes it that in leaving the sun we cleaned him out so completely of his nitrogen and oxygen that not a trace of these gases remains behind to be discovered even by the sensitive vision of the spectroscope...
Pagina 256 - In extending the researches relative to this part of the investigations, a remarkable result was obtained in regard to the distance at which inductive effects are produced by a very small quantity of electricity; a single spark from the prime conductor of the machine, of about an inch long, thrown on the end of a circuit of wire in an upper room, produced an induction sufficiently powerful to magnetize needles in a parallel circuit of wire...
Pagina 313 - Part I. MECHANICS, HYDROSTATICS, and PNEUMATICS. Part II. HEAT. Part III. ELECTRICITY and MAGNETISM. Part IV.
Pagina 118 - Faraday, in his mind's eye, saw lines of force traversing all space where the mathematicians saw centres of force attracting at a distance : Faraday saw a medium where they saw nothing but distance : Faraday sought the seat of the phenomena in real actions going on in the medium, they were satisfied that they had found it in a power of action at a distance impressed on the electric fluids.