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https://www.noaa.gov/media/digital-library-photo/pl23ship4039jpgDescription
Figure 34. Universal current measuring device invented by Otto Petterson in1904. This instrument was intended to measure current and temperature, as wellas collect plankton. Left: in operation. Right: after measurement. Thisinstrument was first tested in the Skagerrak and then in the Baltic Sea between30 and 200 meters water depth. (Image credit: Oceanographic Museum of Monaco | Y. Berard)