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Figure 50. Knudsen bottle (first model) for sampling water while a ship is underway. This bottle of very robust construction was devisedby the Danish professor Martin Knudsen and used in the Kattegat in 1908 on board the C. F. GROVE and also in 1909 on board the THOR when samples were obtained in 250 meters depth in the North Sea between Aberdeen and Stavanger. (Image credit: Oceanographic Museum of Monaco | Y. Berard)