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![Figure 37 ship4042.jpg Figure 37](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4042.jpg?itok=YetKQ0Sw)
Description
Figure 37. Current meter invented by Otto Pettersson 1910 with photographicrecorder. Left: view of the assembled unit. Right: details of themeasuring device and recorder. This was the first current measuring device tobe able to record both direction and strength of current for long periods. Itwas first used from a pontoon at Goteborg in 1911. (Image credit: Oceanographic Museum of Monaco | P. Roggero)