A Bibliography, Guide, and Index to Climate

A Bibliography, Guide, and Index to Climate

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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. 1884 edition. Excerpt: ...portion of air to have arrived at such a height that its diminished temperature no longer allows of its retaining the whole of the moisture it had dissolved when near the surface; the consequence will be that a portion of water is disengaged in the state of what is termed vesicular vapour, that is, holding intermixed with it a portion of atmospheric air. Now, as the air is considerably rarer at the height of two or three miles (the usual elevation of the clouds) than nearer the surface, it may easily happen that the watery vesicles, in the progress of their descent, meet at length with a stratum of such density as to be just equivalent to the weight of the vesicular vapour joined with that of the air intermixed with it; they will remain suspended until the air within becoming of nearly equal density with the atmosphere without, or the particles coalescing into larger drops, the whole becomes too heavy for the atmosphere to support. The presence of intermixed air seems confirmed by the hollow found in the centre of hailstones; and the flakes of snow, which fall so slowly through the air, owe their low specific gravity to the same cause. Cirri seem to be formed immediately from the disengagement of the vesicular vapour, and therefore to occupy that line of elevation at which the quantity (Page 106) of moisture held in an aeriform state is at its minimum; hence we see the reason why they continue for so long a time without having their density increased. Evaporation goes on from the upper surface, while the ascending portions of the air are adding to its bulk on the inferior; and unless the latter exceeds the former the cloud will remain stationary. But when the quantity of vapour disengaged exceeds what is carried off from it by evaporation, the...show more

Product details

  • Paperback | 270 pages
  • 189 x 246 x 14mm | 485g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236603060
  • 9781236603067