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https://www.noaa.gov/media/digital-library-photo/pl23ship4022jpgDescription
Figure 19. Color measuring tube of Julien Thoulet, designed about 1903 to facilitate the use of Forel's color scale. It was only a little more practical than the original form. (Image credit: Oceanographic Museum of Monaco | P. Roggero)
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