pl23_ship4054.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4054jpgDescription
Figure 49. Float invented by Prince Albert I of Monaco and Georges Pouchet for study of currents in the North Atlantic off l'HIRONDELLE in 1887. Left: the unit as it would be seen in the water.Right: the internal structure of the float. A thousand of these floats werereleased mainly northwest of the Azores in July 1887.
Credit
Oceanographic Museum of Monaco
Collection
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Current Measuring Devices