Manual of Astronomy; A Text-Book

Manual of Astronomy; A Text-Book

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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. 1902 edition. Excerpt: ... the equator, the moon moves (relatively) westward faster than the wave can naturally follow it, and so for a while the moon slightly accelerates the wave. The tidal wave is thus, in its origin, a "forced oscillation"; in its subsequent travel it is very nearly, but not entirely, "free." 339. Cotidal Lines.--Cotidal lines are lines drawn upon the Cotidai lines surface of the ocean connecting points which have their high definedwater at the same moment of Greenwich time. They mark the Course of the daily tide-waves. Age of the tide when it reaches various ports. crest of the tide-wave for every hour, and if we could map them with certainty, we should have all necessary information as to the actual motion of the tide-wave. Unfortunately we can get no direct knowledge as to the position of these lines in mid ocean; we can only determine a few points here and there on the coasts and on the islands, so that much is necessarily left to conjecture. Fig. 122 is a reduced copy of a cotidal map, borrowed by permission, with some modifications, from Guyot's Physical Geography. 340. Course of Travel of the Tidal Wave.--In studying this map we find that the main or "parent" wave starts twice a day in the Pacific, off Callao, on the coast of South America. This is shown on the chart by a sort of oval "eye" in the cotidal lines, just as on a topographical chart the summit of a mountain is indicated by an eye in the contour lines. From this point the wave travels northwest through the deep water of the Pacific at the rate of about 850 miles an hour, reaching Kamchatka in ten hours. Through the shallower water to the west and southwest the velocity is only from 400 to 600 miles an hour, so that the wave arrives at more

Product details

  • Paperback | 194 pages
  • 189 x 246 x 10mm | 354g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236627881
  • 9781236627889