What is Electricity?D. Appleton & Company, 1896 - 315 pagini |
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Pagina 14
... lead hung on one arm of a chemical balance by a wire , and attracted by a mass of 154 kilogrammes of lead , showed an apparent increase of about 0.01 milligramme . We perceive from this how small the force is which is to be measured ...
... lead hung on one arm of a chemical balance by a wire , and attracted by a mass of 154 kilogrammes of lead , showed an apparent increase of about 0.01 milligramme . We perceive from this how small the force is which is to be measured ...
Pagina 34
... lead us to expect that if the same law is followed below the melting point of ice as Ewing found above it , then a bar magnet cooled to -182 ° C. ought to gain in magnetic moment something like 30 to 50 per cent . The experiment of Prof ...
... lead us to expect that if the same law is followed below the melting point of ice as Ewing found above it , then a bar magnet cooled to -182 ° C. ought to gain in magnetic moment something like 30 to 50 per cent . The experiment of Prof ...
Pagina 49
... leads to a great development of heat and light ; and here we must bear in mind that the only difference between heat ... lead us far . There is an evidence of pressure in such pipes , and also on con- ductors carrying electric currents ...
... leads to a great development of heat and light ; and here we must bear in mind that the only difference between heat ... lead us far . There is an evidence of pressure in such pipes , and also on con- ductors carrying electric currents ...
Pagina 52
... leads to a great development of heat . These are ap- parently contradictory conclusions . The contradiction , however ... lead pencil . Such a wire opposes very little resistance foot to the flow of the electric current which is used to ...
... leads to a great development of heat . These are ap- parently contradictory conclusions . The contradiction , however ... lead pencil . Such a wire opposes very little resistance foot to the flow of the electric current which is used to ...
Pagina 55
... lead an electric current into these wires at the south pole of the earth and out at the north pole , the current would divide itself proportionately on the meri- dian wires . Each meridian wire would receive the same amount of current ...
... lead an electric current into these wires at the south pole of the earth and out at the north pole , the current would divide itself proportionately on the meri- dian wires . Each meridian wire would receive the same amount of current ...
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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.