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Photometers
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Voyage
History of Oceanography
The Early Instruments Collections
Photometers
Early Instruments
Figure 18. Color measuring scale of Francoise-Alphonse Forel. Forel inventedthis scale in 1887 for the study of the color of water, and precisely for thatof Lake Leman. He conducted his first experiments in Lake Leman in 1887.
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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.
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Figure 20. Color measuring lens of Julien Thoulet designed in 1903 as per theintention of Prince Albert 1st of Monaco. Thoulet tested this instrument at the laboratory at Nancy. It is possible that this instrument was also tested onthe PRINCESS AL
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