Figure 18. Color measuring scale of Francoise-Alphonse Forel. Forel invented
this scale in 1887 for the study of the color of water, and precisely for that
of Lake Leman. He conducted his first experiments in Lake Leman in 1887.
Image ID: ship4021, Voyage To Inner Space - Exploring the Seas With NOAA Collect Photographer: P. Roggero Credit: Oceanographic Museum of Monaco