What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 13
... evidences of the laws of the transformations of energy increases our knowledge upon electricity , but we are absolutely ignorant of the relationship of gravi- tation to the subject of electricity and magnetism , light , heat , and ...
... evidences of the laws of the transformations of energy increases our knowledge upon electricity , but we are absolutely ignorant of the relationship of gravi- tation to the subject of electricity and magnetism , light , heat , and ...
Pagina 41
... evidence of a directive action of gravitation — that is , an elongated cylinder does not tend to place its longer axis vertical on the earth's surface . Maxwell shows that " if we assume that the medium is in a state of stress ...
... evidence of a directive action of gravitation — that is , an elongated cylinder does not tend to place its longer axis vertical on the earth's surface . Maxwell shows that " if we assume that the medium is in a state of stress ...
Pagina 45
... evidence , however , exists that a knowledge of the art of covering a wire uniformly with silk , cotton , or other nonmetallic or insulating substance existed be- fore the time of Benjamin Franklin . Without insulated wire no progress ...
... evidence , however , exists that a knowledge of the art of covering a wire uniformly with silk , cotton , or other nonmetallic or insulating substance existed be- fore the time of Benjamin Franklin . Without insulated wire no progress ...
Pagina 49
... evidence of heat along its path . We have said that the only peculiarity which a pipe conveying steam or compressed air possesses in common with a copper wire conveying an electric current resides in the development of heat along the ...
... evidence of heat along its path . We have said that the only peculiarity which a pipe conveying steam or compressed air possesses in common with a copper wire conveying an electric current resides in the development of heat along the ...
Pagina 58
... evidence of an electric current in the ground ; the electricity , so to speak , seems to have leaked away like water . Yet instruments show that the current apparently flows out from the power house in one direction to the ground and ...
... evidence of an electric current in the ground ; the electricity , so to speak , seems to have leaked away like water . Yet instruments show that the current apparently flows out from the power house in one direction to the ground and ...
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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 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...
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...
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.