What is Electricity?D. Appleton and Company, 1903 - 315 страници |
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Страница 11
... vibration of a hydrogen molecule at a definite tempera- ture and pressure would be an unalterable standard of time , and that the wave length in vacuum of sodium light would form a standard of length independent of any change in the ...
... vibration of a hydrogen molecule at a definite tempera- ture and pressure would be an unalterable standard of time , and that the wave length in vacuum of sodium light would form a standard of length independent of any change in the ...
Страница 21
... vibration attracts a delicately suspended body . Lord Kelvin shows that in fluid mo- tion the average pressure is least when the average energy of motion is greatest . The wave motion is greatest near the fork and the pressure there is ...
... vibration attracts a delicately suspended body . Lord Kelvin shows that in fluid mo- tion the average pressure is least when the average energy of motion is greatest . The wave motion is greatest near the fork and the pressure there is ...
Страница 33
... vibrations to which they are subjected in shipyards . If the molecules of steel are subjected to high temperature - for instance , to a white heat - the steel is deprived of its magnetism . Very interesting work in this field has been ...
... vibrations to which they are subjected in shipyards . If the molecules of steel are subjected to high temperature - for instance , to a white heat - the steel is deprived of its magnetism . Very interesting work in this field has been ...
Страница 36
... vibration was reached the armature would move across the neutral line to and fro , the neutral line acting as a species of cut - off . existence of the neutral line was shown by presenting small tacks to a bar of iron which was moved in ...
... vibration was reached the armature would move across the neutral line to and fro , the neutral line acting as a species of cut - off . existence of the neutral line was shown by presenting small tacks to a bar of iron which was moved in ...
Страница 42
... vibration by the alternating air pump , communica- tion being obtained by means of a tube . The pul- * Repertorium der Physik , xix , 1883 . sators and the oscillators were mounted on suitable balance arms 42 WHAT IS ELECTRICITY ?
... vibration by the alternating air pump , communica- tion being obtained by means of a tube . The pul- * Repertorium der Physik , xix , 1883 . sators and the oscillators were mounted on suitable balance arms 42 WHAT IS ELECTRICITY ?
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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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Страница 302 - ... 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...
Страница 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...
Страница 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.