from The Century Dictionary and Cyclopedia
- n. A graduated scale of colors from blue to yellow, white, or green, for determining the color of ocean or lake water. Well-known examples are Forel's scale from blue to olive, for use in the lake of Geneva; O. Krümmel's modification, to which the name ‘xanthometer’ was first given, for use on the plankton expedition of 1890; and the scale of W. Ule of Halle, who extended the scale to 21 numbers.
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