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![Figure 60 ship4188.jpg Figure 60](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4188.jpg?itok=lergdqq9)
Description
Figure 60. Knudsen inverting bottle invented by Professor Martin Knudsen withthe collaboration of Hans J. Nielsen in 1929. The construction was very simpleand robust as the bottles were to be used in a series on a cable. The appearance and closing mechanism is very similar to the Nansen bottle but the robinettesare replaced by valves. Left: descending. Right: ascending. (Image credit: Oceanographic Museum of Monaco | Y. Berard)