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 o
4/4/2019 2:00:43 PM
Photographer: D. Mille
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments