Letters of Euler on Different Subjects in Physics and Philosophy Volume 2

Letters of Euler on Different Subjects in Physics and Philosophy Volume 2

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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. 1802 edition. Excerpt: ...Mr. Ditericb of Bale, has succeeded, having actually constructed a machine proper for the purpose, under the direction of the celebrated Mr. Daniel Bernouilli. He sent me two of these machines, by means of which I have observed, at Berlin, this inclination of 72 degrees; and however curious, .in other respects, the English and French may be, in prosecuting such enquiries, they have put no great value on Mr. Ditericb's machine, though the only one adapted to the defign. This instance demonstrates how the progress of science may be obstructed by prejudice; hence Berlin and Bale are the only two places on the globe, where the magnetic inesma-1 tion is known. Needles prepared for the construction of compasses are by no means proper to indicate the quantity of magnetic inclination, though they may convey a rough idea of it's effect, because the northern extremity in these latitudes becomes heavier. In order to render serviceable needles intended to discover the. declination, we are under the necessity of destroying the effect of the inclination, by diminishing' the weight of the northern extremity, or increasing that of the southern. To restore the needle to a horizontal position, the last of these methods is usually employed, and a small morsel of wax is affixed to the southern extremity of the needle. You are abundantly dantly sensible, that this remedy applies only to these regions of the globe, where the indinatory power is so much, and no more; and that were we to travel, with such a needle, toward the northern magnetic pole of the earth, the inclinatory power would increase, so that to prevent the effect we would be obliged to increase the quantity of wax at the southern extremity. But were we travelling southward, and approaching the opposite...show more

Product details

  • Paperback | 116 pages
  • 189 x 246 x 6mm | 222g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236595947
  • 9781236595942