Figure 9. Cone for use with Hensen conical net. Invented by Victor
Hensen of the University of Kiel in about 1883. He called this invention "
Korbnetz." In 1901 he described an improved version that contained a tin-plate
envelope. Between these dates, an intermediate form of this net and cone was
used in the course of the Plankton Expedition of 1889.
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