What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 6
... consists in the length of waves in the ether of space . The sun is the source of electro - magnetic waves , and the earth is the scene of transformations of electric energy . A piece of coal burning in a grate has therefore a long ...
... consists in the length of waves in the ether of space . The sun is the source of electro - magnetic waves , and the earth is the scene of transformations of electric energy . A piece of coal burning in a grate has therefore a long ...
Pagina 35
... consisting of an aggregation of magnets suitably suspended can represent most of the phenomena of magnetism , irrespective of rotary phe- nomena . Before the year 1800 the compass represented to the world the principal use of magnetism ...
... consisting of an aggregation of magnets suitably suspended can represent most of the phenomena of magnetism , irrespective of rotary phe- nomena . Before the year 1800 the compass represented to the world the principal use of magnetism ...
Pagina 41
... consisting of tension along the lines of force and 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 ...
... consisting of tension along the lines of force and 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 ...
Pagina 42
... consists of a little tam- bour or drum ( A , Fig . 4 ) , covered on both ends with membrane . The drum , A , is connected by rubber tub- ing to an alternating air pump , which communicates air pulsations to the drum . The oscillator , B ...
... consists of a little tam- bour or drum ( A , Fig . 4 ) , covered on both ends with membrane . The drum , A , is connected by rubber tub- ing to an alternating air pump , which communicates air pulsations to the drum . The oscillator , B ...
Pagina 45
... consists merely of a spool of cotton- or silk - covered wire placed upon an iron core . The rapid development of electrical science during the past thirty years is largely due to the facility with which a piece of iron can be wound with ...
... consists merely of a spool of cotton- or silk - covered wire placed upon an iron core . The rapid development of electrical science during the past thirty years is largely due to the facility with which a piece of iron can be wound with ...
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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.