Elements of Electro-Biology

Elements of Electro-Biology

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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. 1849 edition. Excerpt: ...acts upon the capillaries, and produces redness, and perhaps may thus even influence nutrition, secretion, and excretion; but its practical application will hereafter be considered in minute detail. MAGNETO-ELECTRICITY. (284). Electricity may be derived from magnetism by using very powerful magnets, and revolving before them pieces of soft iron wound round with numerous layers of silk. According to the power of the magnet, the closeness of the approximation of the armatures, and the length and sizes of the wires, so do we obtain greater or less intensity or quantity of electricity by the revolution of the armatures. (285). The magneto-electric apparatus (fig. 21) gives a to-and-fro current, but it may be readily contrived so that every alternate current may be cut off. When thus arranged, it has been found to evolve so much electricity, that a patent has been taken out for the purpose of conducting electro-metallurgic operations by its influence. (286). It is a curious fact, that although this machine gives an intermittent current it causes a constant deflection of a magnetic needle; so that, in its chemical effect, it is equivalent to a constant current, producing similar effects. (287). The magneto-electric apparatus possesses an advantage in its not requiring the aid of a voltaic battery to set it in action. It is always ready, without any preparation, for the purposes of the analyst or therapeutist, in all weathers and at all times. Its only disadvantage is a trifling additional cost in the first instance, in consequence of the price of the permanent magnets, and it moreover requires a certain amount of power to keep its armature revolving. (288). The power of the current can be adjusted to the greatest nicety, by regulating the distance...show more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236590376
  • 9781236590374