What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
Din interiorul cărții
Rezultatele 1 - 5 din 27
Pagina 53
... telephone circuit between Boston and Chicago would mean a great saving of copper , and therefore of money . Twenty - five years ago any speci- men of copper wire would vary in resistance in differ- ent portions of its length by at least ...
... telephone circuit between Boston and Chicago would mean a great saving of copper , and therefore of money . Twenty - five years ago any speci- men of copper wire would vary in resistance in differ- ent portions of its length by at least ...
Pagina 59
... telephone will determine whether there is a flow from one portion of the earth's surface to another when we lead an electric current into the earth and out of it . Let us use the telephone at first merely as a detector of an electrical ...
... telephone will determine whether there is a flow from one portion of the earth's surface to another when we lead an electric current into the earth and out of it . Let us use the telephone at first merely as a detector of an electrical ...
Pagina 60
... telephone wires with two neighbouring wires anywhere along the equator we should hear no click ; there is no flow of electricity between points of the same pressure . If , however , we connect one wire of the telephone at one point on ...
... telephone wires with two neighbouring wires anywhere along the equator we should hear no click ; there is no flow of electricity between points of the same pressure . If , however , we connect one wire of the telephone at one point on ...
Pagina 61
... telephone of low resistance the Morse signals sent from Nova Scotia to Florida could be heard in France . " What we have said in regard to the spreading out of the electric effect or current in the earth is entirely applicable to the ...
... telephone of low resistance the Morse signals sent from Nova Scotia to Florida could be heard in France . " What we have said in regard to the spreading out of the electric effect or current in the earth is entirely applicable to the ...
Pagina 62
... telephone to the water pipes and gas pipes in almost any part of Boston and Cambridge , for one could hear the clicks of the obser- vatory clock from which time signals were sent . The telephone companies no longer , however , use the ...
... telephone to the water pipes and gas pipes in almost any part of Boston and Cambridge , for one could hear the clicks of the obser- vatory clock from which time signals were sent . The telephone companies no longer , however , use the ...
Alte ediții - Afișează-le pe toate
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
Pasaje populare
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.