A Manual of Magnetism: Including Galvanism, Magnetism, Electro-magnetism, Electro-dynamics, Magneto-electricity, and Thermo-electricity

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D. Davis, 1847 - Electromagnetism - 322 pages

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Page 38 - Oxygen and hydrogen combine in the proportion of one volume of the former, to two of the latter, to form water.
Page 152 - ... modern terms, they knew the " law of the inverse ratio of the square of the distance from the centre of the revolution." Some have thought, that in Empedocles's system the foundation of Newton's was to be found ; imagining, that under the name of
Page 173 - A, on the stand, connects with the brass pillar, and thence with one end of the coil. The other end of the coil dips into mercury, contained in a circular cistern of ivory.
Page 50 - Sulphur melts 226 Water boils -- 212 A compound of three parts of tin, five of lead, and eight of Bismuth melts...
Page 207 - ... bars pass in succession over the poles with their extremities very near to them. At B, on the shaft of the wheel, but not insulated from it, is the break-piece, consisting of a small metallic disc, from which project, in a lateral direction, several pins, equal in number to the iron bars; or the disc may be furnished with a corresponding number of teeth. A silver spring connected with one end of the wire surrounding the electro-magnet, plays upon these pins or teeth ; the other end of this wire...
Page 159 - First, it is more natural to fix our attention on the current of positive, than of negative electricity. Secondly, in a vertical wire, a descending current will occur to us more readily than an ascending one : or, if we imagine ourselves borne along by the current, it would be more natural to conceive ourselves moving with our feet foremost ; but if, on the contrary, we suppose ourselves to be at rest, we should conceive the current to be passing from our head to our feet. Our/осе would...
Page 322 - WARE, in the Clerk's Office of the District Court of the District of Massachusetts. STEREOTYPED AT THE BOSTON TYPE AND STEREOTYPE FOUNDRY.
Page 7 - ... pass around through the wires from the copper to the zinc again, to restore the equilibrium of the fluid.
Page 81 - Lie big has suggested a theory of muscular action, which supposes that the contractile force of the muscles is due to a principle set free by the oxidizement of the animal tissues by the blood, in the same way that electricity is set free by the oxidizement of zinc. But even in this theory it will be noticed that the power does not reside in the chemical action, but in an indefinable "principle " developed by chemical action.
Page 269 - ... called a pole changer, was invented by Dr. Page, of Washington. It is composed of two semi-cylindrical pieces of silver, fixed on the axis upon which the keeper revolves, but insulated from that axis, and from each other. To each of the segments is soldered one end of the wire composing the coil. Two silver springs press upon these segments, and convey the electricity to the screw cups or point desired, by means of wires attached to them. The pole changer on the shaft conveys the alternating...

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