What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 11
... 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 electro - magnetic ...
... 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 electro - magnetic ...
Pagina 11
... length in vacuum of sodium light would form a standard of length independent of any change in the force of gravitation and in the di- mensions of the earth . Maxwell remarks in regard to this last suggestion that " it should be adopted ...
... length in vacuum of sodium light would form a standard of length independent of any change in the force of gravitation and in the di- mensions of the earth . Maxwell remarks in regard to this last suggestion that " it should be adopted ...
Pagina 21
... length is very large or very small compared with the dimensions of the body . A tuning fork set in vibration attracts a delicately suspended body . Lord Kelvin shows that in fluid mo- tion the average pressure is least when the average ...
... length is very large or very small compared with the dimensions of the body . A tuning fork set in vibration attracts a delicately suspended body . Lord Kelvin shows that in fluid mo- tion the average pressure is least when the average ...
Pagina 34
... the magnetic moment of small magnets cooled to -182 ° were carried out . Small magnets from half an inch to an inch in length were made of watch spring or steel wire , and were either used separately 34 WHAT IS ELECTRICITY ?
... the magnetic moment of small magnets cooled to -182 ° were carried out . Small magnets from half an inch to an inch in length were made of watch spring or steel wire , and were either used separately 34 WHAT IS ELECTRICITY ?
Pagina 36
John Trowbridge. N S N S N there is a limit to the length of a magnet was early com- mented upon . It is impossible to maintain the poles of a magnet ten feet from each other on a steel bar ; in- termediate poles will generally form ...
John Trowbridge. N S N S N there is a limit to the length of a magnet was early com- mented upon . It is impossible to maintain the poles of a magnet ten feet from each other on a steel bar ; in- termediate poles will generally form ...
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Termeni și expresii frecvente
action alternating current apparatus attraction bodies 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 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 tric tricity tube velocity vibrations voltaic cell zinc
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Pagina 262 - 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...
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Pagina 199 - Electrical matter differs from common matter in this, that the parts of the latter mutually attract, those of the former mutually repel each other.