Proceedings of the American Academy of Arts and Sciences Volume 18

Proceedings of the American Academy of Arts and Sciences Volume 18

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ... which they supposed to be due to magnetization and to reversals of magnetization. Thus Joule) revolved a piece of iron, contained in a tube of water, between the poles of a horseshoe magnet, and measured the rise of temperature and the work done. Van Breda placed an iron cylinder in a coil of copper wire, bored a hole in the iron, and placed the bulb of a spirit thermometer in this hole. On passing a continuous current of electricity through the coil, no increase of temperature was denoted by the thermometer. When, however, the current was made and broken Pogg. Ann., cxi., 1860. t Ann. Phys. Chem., 1881. t Phil. Mag., xxiii. 263, 847, 435,1843. Compt. Rend., xxi. 961; also, Pogg. Ann., Ixviii. 552,1846. thirty times a second by an interrupter, the thermometer showed a marked rise in temperature. Grove surrounded a horseshoe electromagnet with water at a constant temperature, placed a thermo element upon the armature, which was carefully covered with flannel, and found an increase of temperature upon interrupting or reversing the electrical current. He found no effect in non-magnetic metals. Villari f endeavored to show the same effect from transversal magnetism, by passing an interrupted current through two wires, one of lead, and the other of iron or steel. These wires were bent in the middle, placed in glass cylinders, so that their ends projected through corks at each end of the cylinders. The glass cylinders were filled with absolute alcohol, and were provided with capillary tubes, and thus served as spirit thermometers. The cylinders were placed parallel to each other. The circuit was arranged so that the interrupted current preserved always the same direction in the lead wire, while at each interruption it more

Product details

  • Paperback
  • 189 x 246 x 8mm | 286g
  • United States
  • English
  • black & white illustrations
  • 1236967747
  • 9781236967749