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![Figure 41 ship4107.jpg Figure 41](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship4107.jpg?itok=iju-ds4u)
Description
Figure 41. Apstein instrument and graph for determining the depth of horizontally towed nets. First noted by Carl Apstein in 1909, this instrument was usedfor many years to determine the depth of net at various towing speeds and amount of tension on the towing line. (Image credit: Oceanographic Museum of Monaco | D. Mille)