Lectures on Natural and Experimental Philosophy (Volume 4)
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Lectures on Natural and Experimental Philosophy (Volume 4)

Lectures on Natural and Experimental Philosophy (Volume 4)


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About the Book

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. 1794. Excerpt: ... LECTURE XLIIL On THE PLANETARIUM, TELLURIAN, AND LUNARIUM. TO represent by machines the motions and various aspects of the heavenly bodies, the parallelism of the earth's axis, together with it's annual and diurnal motions, and by this means to explain the beautisul variety of seasons and other terrestrial and celestial phenomena, has ever been considered as one of the noblest efforts of mechanical genius. Among the variety of machines contrived for these purposes, that before you (fig. i, pi. 11J is the best adapted for representing the celestial motions. It seems highly probable, that the ancients were not unacquainted with planetary machines, but that the same powers of genius which led them to contemplate and reason upon the heavenly bodies, induced them to realize their ideas, and form instruments for explaining them; and we may fairly presume, these were carried to no small degree of persection, when we consider that of one Archimedes was the maker, and Cicero the encomiest. A planetarium may be considered in some sort as a diametrical section of our universe, in which the upper and lower hemispheres are suppressed. The upper plate is to answer for the ecliptic: on this are placed, in two opposite, but corresponding circles, the days of the month, and the M3 "signS signs of the ecliptic, with their respective characters; by this plate you may set the planetary balls so as to be in their respective places in the ecliptic, for any day in the year. Through the center of this plate, you ob-r serve a strong stem, on which is a brass ball to represent the sun: round the stem are different sockets to carry the arms, by which the several planets are supported. The planets are represented by ivory balls, having the hemisphere which is next the sun white, the...


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Product Details
  • ISBN-13: 9781150776588
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 158
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1150776587
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 295 gr


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