Nature Volume 22

Nature Volume 22

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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. 1880 edition. Excerpt: ...came an interval of comparative silence, then the sound rose again, and by and by the familiar buzz came in; but up to a bright red heat no maximum was reached. On cooling, the phenomena reappeared in the proper order. Cobalt behaves, therefore, just as we should expect from its refractory magnetic nature. I may mention one curious phenomenon that appeared once or twice with cobalt and once or twice with a piece of steel. On cooling, after the maximum was past, the buzz had died away, and a period of comparative silence had come, strong beats began to be heard, which lasted for a considerable time, and then died away as the temperature fell. Various causes for these might be assigned. It might have happened that two parts of the metal were at different temperatures, and gave notes nearly in unison. It may very well have been interference between notes due to permanent and temporary magnetism; for in cobalt generally, and with the particular piece of steel in question, the minimum was not marked by the absolute silence which probably indicates cessation of the sound due to permanent magnetism before that due to temporary magnetism begins. Relation to Tlicrmo-electric Properties.--As it seemed to be of some interest to connect these magnetic sounds with the curious thermo-electric peculiarities of iron and nickel brought to light by the recent researches of Prof. Tait,11 asked the help of his assistant, Dr. C. G. Knott, who has had great experience in work of this kind. The sounding-wire, a short piece of which was always used in order to get the phenomenon pure, was inclosed along with a double or triple thermo-electric junction in a small tube made by rolling up a piece of sheet-copper. The tube was then heated up in the blowpipe flame....
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Product details

  • Paperback
  • 189 x 246 x 41mm | 1,420g
  • United States
  • English
  • black & white illustrations
  • 1236751833
  • 9781236751836