What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 8
... amount of food consumed and the work that a man can do . The most powerful instrument for studying the transformation of energy is still the steam engine . By means of this great invention of Watt we obtain our electrical currents ; and ...
... amount of food consumed and the work that a man can do . The most powerful instrument for studying the transformation of energy is still the steam engine . By means of this great invention of Watt we obtain our electrical currents ; and ...
Pagina 15
... amount of the attraction between small bodies can also be gained from a recent investigation of Prof. C. V. Boys , who finds that the force with which two spheres weigh- ing a gramme each ( about centres 1 centimetre ( about one another ...
... amount of the attraction between small bodies can also be gained from a recent investigation of Prof. C. V. Boys , who finds that the force with which two spheres weigh- ing a gramme each ( about centres 1 centimetre ( about one another ...
Pagina 16
... enough to fill all the Great Lakes . " The amount of mechanical work which the raising of this involves is enormous , and the ordinary concep- * Bulletin C , 1894 . tion of it is quite inadequate . Some idea of 16 WHAT IS ELECTRICITY ?
... enough to fill all the Great Lakes . " The amount of mechanical work which the raising of this involves is enormous , and the ordinary concep- * Bulletin C , 1894 . tion of it is quite inadequate . Some idea of 16 WHAT IS ELECTRICITY ?
Pagina 19
... amount of the ether stress at the earth's surface to account for gravitation would be 4,000 tons on the square inch . " Lord Kelvin has shown that if we suppose all space to be filled with a uniform incompressible fluid , and if we ...
... amount of the ether stress at the earth's surface to account for gravitation would be 4,000 tons on the square inch . " Lord Kelvin has shown that if we suppose all space to be filled with a uniform incompressible fluid , and if we ...
Pagina 20
... amount of this energy is communicated to a body in the form of heat , the amount of heat so gen- erated would raise the whole material universe in a few seconds to a white heat . * Encyclopædia Britannica , Gravitation . " Prof. Challis ...
... amount of this energy is communicated to a body in the form of heat , the amount of heat so gen- erated would raise the whole material universe in a few seconds to a white heat . * Encyclopædia Britannica , Gravitation . " Prof. Challis ...
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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.