Nature Volume 5

Nature 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. 1872 edition. Excerpt: ... much as a two-hundredth part of the angle whose arc is radius, that is to say by 29 of a degree. Not as much as a ten-million-milliontn part of this distortion could be produced every second of time by the lunar influence in the material underlying the earth's crust without very sensibly affecting precession and nutation; for the effect of the maximum couple exerted on the upper crust by the moon is to tum the whole earth in a second of time through an angle of a one-hundred-millionmillionth of 57 of a degree, so as to give to it at the end of a second the position obtained by geometrically compounding this angular displacement with the angular displacement due simply to rotation. Hence the viscosity assumed by Delaunay, to produce the effect he attributes to it, must be more than ten million million million times the viscosity of water. How much more may be easily estimated with some degree of precision from Helmholtz's mathematical solution of the problem of finding the motion of a viscous fluid contained in a rigid spherical envelope urged by periodically varying couples. The most interesting part of the application of this solution to the hypothetical problem regarding the earth, is to find how rapidly the obliquity of the ecliptic would be done away with by any assumed degree of viscosity in the interior; such an amount of viscosity, for example, as would render the excesses of precession and nutation above their values for a perfectly rigid interior, not greater than observation could admit The hypothesis of a continuous internal viscous fluid being disposed of, the question occurs, what rigidity must the interior mass have, even if enclosed in a perfectly rigid crust, to produce the actual phenomena of precession and nutation? The...
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Product details

  • Paperback | 666 pages
  • 189 x 246 x 34mm | 1,170g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236580117
  • 9781236580115