What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 13
... Prof. Poynting , by many refinements , has made it also one of accuracy . The method he at first adopted was to suspend a mass from one arm of a balance by a long wire and counter- poise it in the other pan ; then by bringing under it a ...
... Prof. Poynting , by many refinements , has made it also one of accuracy . The method he at first adopted was to suspend a mass from one arm of a balance by a long wire and counter- poise it in the other pan ; then by bringing under it a ...
Pagina 14
... Prof. Poynting adopted a differential method , which consisted in sus- pending an attracting mass from each arm of a balance instead of from one arm , and bringing another attract- ing mass first under one suspended mass and then under ...
... Prof. Poynting adopted a differential method , which consisted in sus- pending an attracting mass from each arm of a balance instead of from one arm , and bringing another attract- ing mass first under one suspended mass and then under ...
Pagina 15
... Prof. Poynting's experiments , taking 4 millimetres as the distance between the threads and supposing the bracket to be 600 millimetres below the knife edge of the balance , the mirror turns through an angle 150 times as great as that ...
... Prof. Poynting's experiments , taking 4 millimetres as the distance between the threads and supposing the bracket to be 600 millimetres below the knife edge of the balance , the mirror turns through an angle 150 times as great as that ...
Pagina 20
... 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 has investigated the mathematical theory of the 20 WHAT IS ELECTRICITY ?
... 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 has investigated the mathematical theory of the 20 WHAT IS ELECTRICITY ?
Pagina 21
John Trowbridge. " Prof. Challis has investigated the mathematical theory of the effect of waves of condensation and rare- faction " in an elastic fluid on bodies immersed in the fluid . He concludes that the effect of such waves would ...
John Trowbridge. " Prof. Challis has investigated the mathematical theory of the effect of waves of condensation and rare- faction " in an elastic fluid on bodies immersed in the fluid . He concludes that the effect of such waves would ...
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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.