Living Age Volume 113

Living Age Volume 113

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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. 1872 edition. Excerpt: ...of error in the indications of the thermometer--that the enormous pressure of the water upon the glass bulb will very probably so alter the shape of the bulb as to force up the mercury in the tube, so as to cause it to register a temperature several degrees higher than that which it actually encountered. Now it has only been recently-through the ingenious contrivance of my late excellent friend, Professor Miller, of King's College--that this didiculty has been overcome. Ve found, on putting thermometers of ordinary construction into the water-chamber of an instrumeut constructed on the principle of the Bramah press, with a. powerful forcepump that should subject these thermometers _to pressure of any amount up to three tons to the square inch. that the very best instruments that had been previously relied upon were raised from eight to ten degrees by the pressure of the water forced in; and we found that inferior thermometers, such as had been used in many deepsea soundings on former occasions, were raised from twenty to fifly degrees. So that you see there is no reliance to be placed on any previous deep-sea soundings as to temperature, except in this, that we know that the error of their thermometers could not have been less than a certain amount. For instance, when Sir James Ross and his companions carried on their deep soundings in the Southern seas, and found, as they very often did, at a depth of from 1,500 to 2,000 fathoms, that their thermometers indicated a temperature of 39 or 40 degrees, we now know that the smallest error of their thermometers being seven or eight degrees at those depths, the true temperature could not have been higher than about 32 degrees--that is, about the freezing point of fresh water. The means more

Product details

  • Paperback
  • 189 x 246 x 33mm | 1,134g
  • United States
  • English
  • black & white illustrations
  • 123688955X
  • 9781236889553