Bulletin of the Philosophical Society of Washington Volume N . 12

Bulletin of the Philosophical Society of Washington Volume N . 12

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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. 1895 edition. Excerpt: ...downward and their lower portions flowed inward toward the center of the cup. The inward flow from all sides produced at the center an upward movement, occasioning the central hill. The effect was perhaps heightened by the elastic recoil of a considerable tract of the moon's mass below and about the point of impact. At the same time the fused parts, which were partly determined by the distribution of strains and partly by the occurrence of local passages of more fusible material, flowed to the bottom of the cup, either surrounding the central bill or, if in great volume, submerging it. Sometimes minor tracts of fused matter occurred in the wreath, and the exudation of these gave rise to lava streams flowing down the outer slope. The inward flow of the lower portions of the walls undermined the upper portions, including the inner part of the wreath, so that they settled down toward and into the liquid pool of the interior, and this settling gave rise to the inner cliff and the inner terraces. In the case of some of the large craters all of the wreath was carried down. The effect of the collision on the moonlet was not uniform throughout. The part in immediate contact with the moon, being compressed by the shock of the entire mass behind it, was probably heated more than any other part. The opposite portion of the moonlet, sustaining no blow from behind and having its motion arrested in a comparatively gradual way, was less affected and probably never fused; the results of laboratory experiment indicate that it remained central in the crater and was uplifted by the recoil so as to constitute the surface of the central hill. The impact theory as thus developed appears competent to explain the origin of all typical features of the lunar craters. Its...
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Product details

  • Paperback | 176 pages
  • 189 x 246 x 10mm | 327g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236595149
  • 9781236595140