. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. 2l8 DEPTHS OF THE OCEAN CHAP. Two thermometers used simul- taneously. temperature of 200 C, the mercury - thread would have expanded a little, giving a reading perhaps of C. in- stead of ° C. This secondary change is easily calculated when the temperature of the mercury at the reading- off is known, and so inside the protective tube Richter has placed a small auxiliary ther- mometer (d)
. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. Oceanography. 2l8 DEPTHS OF THE OCEAN CHAP. Two thermometers used simul- taneously. temperature of 200 C, the mercury - thread would have expanded a little, giving a reading perhaps of C. in- stead of ° C. This secondary change is easily calculated when the temperature of the mercury at the reading- off is known, and so inside the protective tube Richter has placed a small auxiliary ther- mometer (d), which gives the reading tem- perature, and thereby a correction for the read- ing. In many cases it is necessary to have the temperature determined with the highest possible degree of accuracy, and Richter's reversing ther- mometer is very satis- factory in this respect. During the " Michael Sars" Atlantic Expedi- tion the temperature series were taken almost exclusively by the aid of these thermometers, and in most instances two thermometers were used simultaneously, so as to make quite sure of the determinations. When the readings were cor- rected it was found that the mean difference be- tween the values given by the two thermome-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, John, Sir, 1841-1914; Hjort, Johan, 1869-. London Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
