The British Quarterly Review Volume 61-63

The British Quarterly Review Volume 61-63

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 edition. Excerpt: ... northern or southern hemisphere was in Aphclion '3 Of course, the problcni is by no means so simple as this suggestion indicates, as many disturbing forces enter into the question. I In fact, there can be no doubt but that another prineipal cause of the variations of tempcratureare the ocean currents, which, flowing from the equator towards the poles, carry with them a large portion of the superfluous heat of the tropics; and a very important question arises, What is the cause of these ocean currents? The theories on the subject may be divided into the gravitation theories and the wind theories. The former may be subdivided as Lieutenant lIaury's and Doctor Carpentcr's. Lieutenant Maury thought that the ocean current, generally a surface one of hot water from the equator to the pole, and a reflex deep sea current of cold water back again, was caused by the difference of hcight at which the water of the equator stood to that at the poles, owing to the difference of specific gravity between cold and warm water, and between salter and less salt water; but Lieutenant Maury appears to have overlooked the fact that these two differences neutralize the other: the warmer and salter water matching the colder and less salt; but the coup dc grace seems to be given both to this and to Doctor Carpenter's theory by the discovery of the C/aallr-nger Expedition, that the water of the ocean at the equator is not so high as in the temperate and polar regions. On the other hand, a cursory examination of tl1c map given by Mr. Croll, showing the directions of the prevailing winds, from Messrs. Johnston's 'Physical Atlas, ' and the direction of ocean currents from the current chart published by the Admiralty, will go far more

Product details

  • Paperback | 776 pages
  • 189 x 246 x 39mm | 1,361g
  • United States
  • English
  • black & white illustrations
  • 1236919513
  • 9781236919519