The Discovery of Induced Electric Currents, Volume 12

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Page 14 - The magnet was then revolved by a piece of string passed round it, and the galvanometer-needle immediately indicated a powerful current of electricity. On reversing the order of rotation, the electrical current was reversed. The direction of the electricity was the same as if the copper cylinder (219) or a copper wire had revolved round the fixed magnet in the same direction as that which the magnet itself had followed. Thus a singular independence of the magnetism and the bar in which it resides...
Page 2 - By trial with a trough each was insulated from the other. Will call this side of the ring A. On the other side but separated by an interval was wound wire in two pieces together amounting to about 60 feet in length, the direction being as with the former coils; this side call B.
Page 20 - ... revolution was reversed, the needle was inclined on the other side, in accordance with the results anticipated. 242. Thus the reasons which induce me to suppose a particular state in the wire (60) have disappeared; and though it still seems to me unlikely that a wire at rest in the neighbourhood of another carrying a powerful electric current is entirely indifferent to it, yet I am not aware of any distinct facts which authorize the conclusion that it is in a particular state.
Page 9 - ... opposite directions at the same time; their action 'then combined to affect the galvanometer: but all the results were reducible to those above described. 179. The longer the extent of the moving wire, and the greater the space through which it' moves, the greater is the effect upon the galvanometer. 180. The facility with which electric currents are produced in metals when moving under the influence of magnets, suggests that henceforth precautions should always be taken, in experiments upon...
Page 38 - I was a very lively imaginative person, and could believe in the 'Arabian Nights,' as easily as in the 'Encyclopaedia.' But facts were important to me, and saved me. I could trust a fact, and always cross-examined an assertion. So when I questioned Mrs. Marcet's...
Page 33 - I have long thought there must be a particular condition of such bodies corresponding to the state which causes currents in metals and other conductors (26. 53. 191. 201. 213.) ; and considering that the bodies are insulators one would expect that state to be one of tension. I have by rotating non-conducting bodies near magnetic poles and poles near them, and also by causing powerful electric currents to be suddenly formed and to cease around and about insulators in various directions, endeavoured...
Page 3 - ... feet long); then it was quickly thrust in the whole length and the galvanometer needle moved ; then pulled out, and again the needle moved, but in the opposite direction. This effect was repeated every time the magnet was put in or out...
Page 31 - The introduction of plates of shell-lac, sulphur, or copper into the intervals between the magnet and these helices (1713.), produced not the least effect, whether the former were quiescent or in rapid revolution (1715.). So here no evidence of the influence of the intermediate particles could be obtained (1710.). 1720. The magnet was then removed and replaced by a flat helix, corresponding to the two former, the three being parallel to each other. The middle helix was so arranged that a voltaic...
Page 43 - Elementary Manual of Chemistry BY FH STORER, SB, AM, and WB LINDSAY, AB, BS Cloth, 12mo, 453 pages. Illustrated. Price, $1.20 This work is the lineal descendant of the " Manual of Inorganic Chemistry" of Eliot and Storer, and the "Elementary Manual of Chemistry" of Eliot, Storer and Nichols.
Page 48 - While the general and distinctive features of the former work have been preserved, the book has been thoroughly revised, enlarged, and improved. As now published, it combines the results of the life experience and observation of its distinguished author with the latest discoveries and researches in the science. DANA'S MANUAL OF GEOLOGY $5.00 Fourth Revised Edition. This great work is a complete thesaurus of the principles, methods, and details of the science of geology in its varied branches, including...

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