Electricity and Magnetism: Being a Series of Advanced Primers (Google eBook)

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Electrical World and Engineer, 1899 - Electricity - 318 pages
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Page 254 - And when the rain has wet the. kite and twine, so that it can conduct the electric fire freely, you will find it stream out plentifully from the key on the approach of your knuckle. At this key the phial...
Page 20 - I went into the cube and lived in it, and using lighted candles, electrometers, and all other tests of electrical states, I could not find the least influence upon them, or indication of anything particular given by them, though all the time the outside of the cube was powerfully charged, and large sparks and brushes were darting off from every part of its outer surface.
Page 20 - ... the outside of the insulated cube was everywhere strongly charged. But putting the chamber in communication with the perfect discharging train described in a former series (292.), and working the machine so as to bring the air within to its utmost degree of charge, if I quickly cut off the connexion with the machine, and at the same moment or instantly after insulated the cube, the air within had not the least power to communicate a further charge to it. If any portion of the air was electrified,...
Page 92 - Ike current is directly proportional to the electromotive force and inversely proportional to the resistance.
Page 161 - INDUCTION, MAGNETIC. The production of magnetism in a magnetizable substance by bringing it into a magnetic field.
Page 116 - Hence one foot-pound = 1 - 356 joules, or one joule = - 7373 foot-pound. The elaborate researches of Mr. Joule, after whom this practical unit is called, have shown that the amount of heat required to raise one gramme of water one degree centigrade in temperature is equal to 4- 2 joules, or to 42 million ergs, or 3 -096 foot-pounds.
Page 20 - ... considered a highly electrified state (being, in fact, the same state as that of the air of a room in which a powerful machine is in operation), and at the same time the outside of the insulated cube was everywhere strongly charged. But putting the chamber in communication with the perfect discharging train described in a former series (292.), and working the machine so as to bring the air within to its utmost degree of charge if I quickly cut off...
Page 160 - Before the pole of an electro-magnet, he suspended a fragment of his famous heavy glass ; and observed that when the magnet was powerfully excited the glass fairly retreated from the pole. It was a clear case of magnetic repulsion. He then suspended a bar of the glass between two poles ; the bar retreated when the poles were excited, and set its length eguatorially or at right angles to the line joining them.
Page 19 - I carried these experiments on with air to a very great extent. I had a chamber built, being a cube of twelve feet in the side. A slight cubical wooden frame was constructed, and copper wire passed along and across it in various directions, so as to make the sides a large net-work, and then all was covered in with paper, placed in close...
Page 228 - Discoveries crouded upon discoveries ; improvements upon improvements ; and the science ever since that time went on with so rapid a course, and is now spreading so amazingly fast, that it seems as if the subject would soon be exhausted, and electricians arrive at an end of their researches...

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