What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 13
... increases our knowledge upon electricity , but we are absolutely ignorant of the relationship of gravi- tation to the subject ... increase in weight would be the quantity sought if the attracting mass had no appreciable effect before its ...
... increases our knowledge upon electricity , but we are absolutely ignorant of the relationship of gravi- tation to the subject ... increase in weight would be the quantity sought if the attracting mass had no appreciable effect before its ...
Pagina 14
... increase of about 0.01 milligramme . We perceive from this how small the force is which is to be measured , and in order to determine it with accuracy Prof. Poynting adopted a differential method , which consisted in sus- pending an ...
... increase of about 0.01 milligramme . We perceive from this how small the force is which is to be measured , and in order to determine it with accuracy Prof. Poynting adopted a differential method , which consisted in sus- pending an ...
Pagina 15
... increased . " In 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 ...
... increased . " In 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 ...
Pagina 23
... increase in the velocity up- ward would be proportionally effectual . A machine was devised which could give a rapidly alternating up .. and - down motion . " Here end my trials for the present . The results are negative . They do not ...
... increase in the velocity up- ward would be proportionally effectual . A machine was devised which could give a rapidly alternating up .. and - down motion . " Here end my trials for the present . The results are negative . They do not ...
Pagina 34
... increase of temperature of 150 ° C. above 10 ° caused a reduction of the magnetic moments of a bar magnet by about 40 per cent , and that the magnet on cooling recovered its original state . This result would lead us to expect that if ...
... increase of temperature of 150 ° C. above 10 ° caused a reduction of the magnetic moments of a bar magnet by about 40 per cent , and that the magnet on cooling recovered its original state . This result would lead us to expect that if ...
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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.