What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 32
... pole of the earth , it immediately acquires the property of a magnet , its magnetic fluid being drawn or forced from one extremity to the other ; and this effect con- tinues as long as it remains in the same position , one of its ...
... pole of the earth , it immediately acquires the property of a magnet , its magnetic fluid being drawn or forced from one extremity to the other ; and this effect con- tinues as long as it remains in the same position , one of its ...
Pagina 33
... pole , would travel toward the north pole of the earth - and is struck a sharp blow with a hammer , it will become magnetic . Its condition can be tested by presenting its ends to an ordinary compass . If , on the other hand , it is ...
... pole , would travel toward the north pole of the earth - and is struck a sharp blow with a hammer , it will become magnetic . Its condition can be tested by presenting its ends to an ordinary compass . If , on the other hand , it is ...
Pagina 38
... pole was considered to act upon another as if it were an action at a distance and not from point to point in the medium between the attracting poles . It is well to consider these two points of view carefully , for in the present study ...
... pole was considered to act upon another as if it were an action at a distance and not from point to point in the medium between the attracting poles . It is well to consider these two points of view carefully , for in the present study ...
Pagina 39
... poles of the earth . An examina- tion of the terminology of a subject often will show the trend of the subject . We speak to - day of the flow or flux of magnetic induction , and we picture to ourselves this flow as taking place from one ...
... poles of the earth . An examina- tion of the terminology of a subject often will show the trend of the subject . We speak to - day of the flow or flux of magnetic induction , and we picture to ourselves this flow as taking place from one ...
Pagina 41
... poles would attract each other more strongly . The early electricians divided all bodies into two classes ... pole , instead of in this line , as a bar of iron or steel would do . In the case of electricity and magnetism the ...
... poles would attract each other more strongly . The early electricians divided all bodies into two classes ... pole , instead of in this line , as a bar of iron or steel would do . In the case of electricity and magnetism the ...
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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.