The cyanometer is attributed to Horace-Bénédict de Saussure (1740–99), a Swiss physicist and geologist, famous for his studies of the geology, meteorology, and botany of the mountainous regions of Europe, particularly the Alps. The cyanometer had 53 sections, ranging from white to varying shades of blue (dyed with Prussian blue) and then to black, arranged in a circle. The color circle can be compared to any area of sky.
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