What is Electricity?D. Appleton and Company, 1903 - 315 страници |
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Страница 11
... amount of food consumed and the work that a man can do . The most powerful instrument for studying the transformation of energy is still the steam engine . By means of this great invention of Watt we obtain our electrical currents ; and ...
... amount of food consumed and the work that a man can do . The most powerful instrument for studying the transformation of energy is still the steam engine . By means of this great invention of Watt we obtain our electrical currents ; and ...
Страница 15
... amount of the attraction between small bodies can also be gained from a recent investigation of Prof. C. V. Boys , who finds that the force with which two spheres weigh- ing a gramme each ( about of a pound ) with their centres 1 ...
... amount of the attraction between small bodies can also be gained from a recent investigation of Prof. C. V. Boys , who finds that the force with which two spheres weigh- ing a gramme each ( about of a pound ) with their centres 1 ...
Страница 16
... enough to fill all the Great Lakes . " The amount of mechanical work which the raising of this involves is enormous , and the ordinary concep- * Bulletin C , 1894 . tion of it is quite inadequate . Some idea of 16 WHAT IS ELECTRICITY ?
... enough to fill all the Great Lakes . " The amount of mechanical work which the raising of this involves is enormous , and the ordinary concep- * Bulletin C , 1894 . tion of it is quite inadequate . Some idea of 16 WHAT IS ELECTRICITY ?
Страница 19
... amount of the ether stress at the earth's 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 ...
... amount of the ether stress at the earth's 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 ...
Страница 20
... amount of this energy is communicated to a body in the form of heat , the 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 ...
... amount of this energy is communicated to a body in the form of heat , the 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 ...
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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 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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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.