Rudiments of Natural Philosophy

Rudiments of Natural Philosophy

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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. 1852 edition. Excerpt: ...each end, forming tufts, Fig. 67. as is shown in figure 67. These two points are called the poles, and the straight line that joins them, the axis of the magnet. If we suspend, by a fine thread, a small needle, and approach toward it either pole of a metallic bar, the needle will rush toward it and attach itself strongly to the pole. By rubbing the needle on one of the poles of the magnet it will itself imbibe the same power of attracting iron, and become a magnet, having its poles. If we now bring first one pole of the magFig. 68. Fig. 69. netic bar toward the needle, and then the other pole, we shall find that one attracts, and the other repels the needle. Figure 68 represents two large sewing needles, magnetized, and suspended by fine threads. On approaching the north pole of a magnetic bar to the north poles of the needles, they are forcibly repelled; but on applying the south pole of a bar, as in figure 69, the north poles of the needles are attracted toward it. two senses in which the word is used. What are magnetic bars 1 what are the poles-r-the axis 1 How may a needle be magnetized How are its properties changed by this process 1 150. Let us suppose that the long needle represented in figure 70, has been rubbed on a magnet, so as to imbibe its properties, or to become magnetized; then, on 3i2 balancing it on a pivot, it will jj of its own accord place itself in nearly a north and south line, and return forcibly to this position when drawn aside from it. This property is called the directive, while the other is called the attractive, property of the magnet. That end which points northward, is called the North Pole of the magnet, and that end which points southward, is called the South Pole. Every magnet has these two poles, ..
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Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236572319
  • 9781236572318