What is Electricity?D. Appleton and Company, 1903 - 315 страници |
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Страница 19
... surface to account for gravitation would be 4,000 tons on the square inch . " Lord Kelvin has shown that if we suppose all space to be filled with a uniform incompressible fluid , and if we suppose either that material bodies are always ...
... surface to account for gravitation would be 4,000 tons on the square inch . " Lord Kelvin has shown that if we suppose all space to be filled with a uniform incompressible fluid , and if we suppose either that material bodies are always ...
Страница 39
... surface free from lines of force we must employ a thick - walled hollow sphere of iron . In the space inside the sphere there will be no lines of force . The space has been , so to speak , swept free of lines of force , and there is a ...
... surface free from lines of force we must employ a thick - walled hollow sphere of iron . In the space inside the sphere there will be no lines of force . The space has been , so to speak , swept free of lines of force , and there is a ...
Страница 41
... surface . Maxwell shows that " if we assume that the medium is in a state of stress , consisting of tension along the lines of force and pressure in all directions at right angles to the lines of force , the tension and the pressure ...
... surface . Maxwell shows that " if we assume that the medium is in a state of stress , consisting of tension along the lines of force and pressure in all directions at right angles to the lines of force , the tension and the pressure ...
Страница 59
... surface to another when we lead an electric current into the earth and out of it . Let us use the telephone at first merely as a detector of an electrical flow , just as we used in the above illustration a pipe connecting two pipes in ...
... surface to another when we lead an electric current into the earth and out of it . Let us use the telephone at first merely as a detector of an electrical flow , just as we used in the above illustration a pipe connecting two pipes in ...
Страница 72
John Trowbridge. of chemical action and electrical action . When we touch the lower surface of our tongue with the wire from one plate or pole of a battery , and the upper surface with the wire leading to the other pole of the battery ...
John Trowbridge. of chemical action and electrical action . When we touch the lower surface of our tongue with the wire from one plate or pole of a battery , and the upper surface with the wire leading to the other pole of the battery ...
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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 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.