What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 14
... end to a fixed support , S , independent of the balance . The angle through which the mirror , M , turns for a given motion of the M FIG . 1 . pointer is inversely as the distance between it and the 14 WHAT IS ELECTRICITY ?
... end to a fixed support , S , independent of the balance . The angle through which the mirror , M , turns for a given motion of the M FIG . 1 . pointer is inversely as the distance between it and the 14 WHAT IS ELECTRICITY ?
Pagina 15
... distance the sensibility of the arrangement may be almost indefi- nitely increased . " In Prof. Poynting's experiments , taking 4 millimetres as the distance between the threads and supposing the bracket to be 600 millimetres below the ...
... distance the sensibility of the arrangement may be almost indefi- nitely increased . " In Prof. Poynting's experiments , taking 4 millimetres as the distance between the threads and supposing the bracket to be 600 millimetres below the ...
Pagina 20
John Trowbridge. tween any two bodies inversely as the square of the distance . If , however , one of the bodies were a gen- erator of the fluid and the other an absorber of it , the bodies would repel each other . " Maxwell , * in ...
John Trowbridge. tween any two bodies inversely as the square of the distance . If , however , one of the bodies were a gen- erator of the fluid and the other an absorber of it , the bodies would repel each other . " Maxwell , * in ...
Pagina 26
... distance of eight miles , to attend the lectures of Prof. John Winthrop , the first Professor of Physics at Harvard University , I was in- terested to ascertain how much he learned of the subject of electricity . In the college archives ...
... distance of eight miles , to attend the lectures of Prof. John Winthrop , the first Professor of Physics at Harvard University , I was in- terested to ascertain how much he learned of the subject of electricity . In the college archives ...
Pagina 35
... distance , without the intervention of any medium between the poles . We shall see that the great advances in our knowledge of electricity and magnet- ism have come from our study of the actions in the medium between two magnetic poles ...
... distance , without the intervention of any medium between the poles . We shall see that the great advances in our knowledge of electricity and magnet- ism have come from our study of the actions in the medium between two magnetic poles ...
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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.