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Figure 9. Buchanan piezometer (Water Model). John Buchanan was responsible forthe systematic use of various apparatus for the study of sea water and itsproperties during the CHALLENGER Expedition. To that end, he invented anddeployed numerous piezometers including this one that was tested March 6, 1876, in the south Atlantic at Lat. 37 S, Long. 43 W. (Image credit: Oceanographic Museum of Monaco | Y. Berard)