Magnetic Induction in Iron and Other Metals

Magnetic Induction in Iron and Other Metals

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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. 1894 edition. Excerpt: ...occurred at a very early point in the process of magnetisation. In another case1' the magnetisation of the specimen was examined at intermediate points, during heating and during cooling, to see whether there was hysteresis in the relation of magnetism to temperature. The specimen--a long iron wire--was fixed inside a glass tube which could be connected at one end to any one of three small boilers capable of supplying a steady current of steam, of alcohol vapour, and of sulphuric ether vapour, or to a cistern supplying cold water. Steam and cold water (at 14C.) were alternately passed through the tube many times until the magnetic state of the wire was observed to change from one to the other of two nearly steady values. Then readings of the magnetometer were taken during the passage through the tube of (1) cold water, (2) ether vapour, (3) alcohol vapour, (4) steam, (5) alcohol vapour, (6) ether vapour, (7) cold water. This completed a cycle of temperature changes in which two intermediate points (35C. and 78!, -C.) were fixed during the process of heating and cooling. The method was adopted in order to secure that the iron should be exposed sufliciently long to an atmosphere of definite temperature to give it time to take that temperature throughout, and so avoid any possibility of error proceeding from the sluggishness with which changes of temperature take place. The stream of vapour was kept up in every case until the magnetometer reading became steady. The iron was magnetised to begin with sufliciently strongly to make the heating cause a diminution and the cooling cause an augmentation of magnetism. The only magnetic force in action during the heating and cooling was the earth's vertical field. In the following statement of...show more

Product details

  • Paperback | 98 pages
  • 189 x 246 x 5mm | 191g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236916425
  • 9781236916426