Fitxer: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 (1912) (20860969225).jpg
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DescripcióThe 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 (1912) (20860969225).jpg
Text Appearing Before Image: PHYSICAL OCEANOGRAPHY 263 ledge of the motions of the sea, for which purpose direct current-measurements are necessary. Measuring the currents at different depths in the sea is much more difficult than might appear at first sight, and re- Text Appearing After Image: Fig. 177.—Ekman's Current-Meter. quires good apparatus. Many excellent current-meters have been constructed, the one made use of during the cruises of the Michael Sars" being that invented by V. W. Ekman, Ekman's represented in Fig. 177. The apparatus consists of a double current'meter- wing (A), that points in the direction of the current. In front
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