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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Photographer: P. Roggero
Credit: Oceanographic Museum of Monaco
Subject: Oceanography
Subject: Historical instruments