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Figure 15. Zacharias ethmophore plankton filter devised by Otto Zacharias in1907. Top: view of the assembled apparatus. Bottom: internal speed reductionvalve. This instrument was devised to collect plankton under adverse meteorological conditions where normal net-towing operations became impossible. This instrument was first used in a lake, but then in the Mediterranean and Tyrhennian. (Image credit: Oceanographic Museum of Monaco | D. Mille)