Popular Electricity and the World's Advance Volume 5

Popular Electricity and the World's Advance Volume 5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...It has also been found that, when the vessel proceeds on her voyage, the buffeting of the waves and the vibration of the engines will induce further magnetism; and as the direction of the vessel is changed, so does the polarity become changed, and the compass is, accordingly, again bewildered and demoralized. On a course running east and west--as from Liverpool to New York and return--this deviation of the compass is often as much as four degrees one way or the other, according as the ship is proceeding easterly or westerly. Devices are now employed in all ship's compasses by which they may be instantly corrected, but constant watchfulness and testing are still imperative. Magnets are made by rubbing a piece of iron against lodestone--a mineral substance which is found over the entire globe. They can also be made, as before stated, by simply hammering any bar of steel or iron while it is pointed due north. If the metal is soft it will quickly lose its magnetism; if hard it becomes a permanent magnet. The commercial manufacture of magnets, however, is now entirely by electricity. A coil of wire is provided, into which the iron or steel of any desired shape is inserted; a strong current of electricity is switched on, and in a moment the rod is magnetized. As in other processes, if the iron is hard a permanent magnet is the result; if the metal is soft its magnetism leaves it the moment the current is cut off. It is this peculiar property of soft iron, of instantly becoming magnetized and demagnetized, which makes the electromagnet; and the electro-magnet is the inward soul--if so strong a metaphor may be used--of the great light and power generator of the present day. But that is another story. Getting Ready for the Opportunity Mr. George A. Damon, ...show more

Product details

  • Paperback | 572 pages
  • 189 x 246 x 29mm | 1,007g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236605489
  • 9781236605481