Archive image from page 356 of The depths of the sea. The depths of the sea. An account of the general results of the dredging cruises of SS. Porcupine and Lightning during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, , J. Gwyn Jeffreys, , and Dr. Wyville Thomson, depthsofseaaccou00tho Year: 1873 CHAP. VI1. | DEEP-SEA TEMPERATURES. 21)5 depths in the ocean, to determine the amount and sources of error, to ascertain which was the most satisfactory instrument, and if possible to construct a scale by which the observations hitherto t
Archive image from page 356 of The depths of the sea. The depths of the sea. An account of the general results of the dredging cruises of SS. Porcupine and Lightning during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, , J. Gwyn Jeffreys, , and Dr. Wyville Thomson, depthsofseaaccou00tho Year: 1873 CHAP. VI1. | DEEP-SEA TEMPERATURES. 21)5 depths in the ocean, to determine the amount and sources of error, to ascertain which was the most satisfactory instrument, and if possible to construct a scale by which the observations hitherto taken with ordinary instruments might be roughly cor- rected, so as to be made available. As there was some difficulty in getting the use of a suitable press, Mr. Casella undertook to have a testing apparatus constructed at his own place in Hatton Garden, capable of producing a pressure of three tons on the square inch. The results were very The first expe- riment went to test the value of the various instru- ments. A Miller-Casella thermometer was placed in the cylinder with No. 57, a good thermometer by Casella, of the ordinary Hydrographic Office pattern, and they were subjected together to a pressure of 4,032 lbs., equal to 1,480 fathoms, with the following result :— That is to say, the temperature remaining the same, the pressure forced up No. 57 to 12°75 C, and left its index there. i On Deep Sea Thermometers, by Captain J. E. Davis, Nature, vol. iii. p. 124. Abridged from a Paper read before the Meteorolo- gical Society, April 19th, 1871.
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