pl23_ship4107.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4107jpgDescription
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.
Credit
Oceanographic Museum of Monaco
Photographer
D. Mille
Collection
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Biologic Sampling Apparatus
Keywords
Oceanography
Historical instruments