pl23_ship4012.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship4012jpgDescription
Figure 11. W. F. Ewald's photometer, messenger model, at the end of operation.Invented by Wolfgang F. Ewald about 1910 to fix some of the problems of theprevious model. First tested about 1910 off the coast of Scotland. Other tests were then made off Capri.
Credit
Oceanographic Museum of Monaco
Photographer
P. Roggero
Collection
Voyage to Inner Space
History of Oceanography Collection
The Early Instruments - Collections of the Oceanographic Museum at Monaco
Photometers
Keywords
Oceanography
Historical instruments