What is Electricity?D. Appleton and Company, 1903 - 315 pagini |
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Pagina 88
... reflection that these philosophers could have made their discoveries by merely employing the microscope , using the agency of light to discover the manifestations of electricity . We have said that a compass instantly points to a wire ...
... reflection that these philosophers could have made their discoveries by merely employing the microscope , using the agency of light to discover the manifestations of electricity . We have said that a compass instantly points to a wire ...
Pagina 90
... reflected from this mirror upon a distant scale or into a suitable telescope . A small movement of the magnet thus results in a large movement of the beam of light on the distant scale . This is a method of magnifying small movements ...
... reflected from this mirror upon a distant scale or into a suitable telescope . A small movement of the magnet thus results in a large movement of the beam of light on the distant scale . This is a method of magnifying small movements ...
Pagina 97
... reflection of a spot of light from the tiny mirror . By means of such a reflection we can practically increase Faraday's graduated circle of four inches in diameter to a circle of one hundred and twenty inches in diameter ; and ...
... reflection of a spot of light from the tiny mirror . By means of such a reflection we can practically increase Faraday's graduated circle of four inches in diameter to a circle of one hundred and twenty inches in diameter ; and ...
Pagina 183
... of the spark . If the mirror , M , is at rest , the photo- graph obtained by reflection at P is simply a zigzag line . When , however , the mirror revolves very swiftly the photograph of the spark is drawn out into a THE LEYDEN JAR . 183.
... of the spark . If the mirror , M , is at rest , the photo- graph obtained by reflection at P is simply a zigzag line . When , however , the mirror revolves very swiftly the photograph of the spark is drawn out into a THE LEYDEN JAR . 183.
Pagina 193
... reflected to the focus b , and raises the bit of platinum to incandescence . This lamp may be said to be the fore- runner of the later attempts of Tesla to produce light by high electro - motive force . The tube is of importance also in ...
... reflected to the focus b , and raises the bit of platinum to incandescence . This lamp may be said to be the fore- runner of the later attempts of Tesla to produce light by high electro - motive force . The tube is of importance also in ...
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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.