A cyanometer (from cyan and -meter) is an instrument for measuring `blueness`, specifically the colour intensity of blue sky. It is attributed to Horace-Bénédict de Saussure and Alexander von Humboldt. It consists of squares of paper dyed in graduated shades of blue and arranged in a color circle or square that can be held up and compared to t.....
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http://en.wikipedia.org/wiki/Cyanometer
instrument for measuring blueness of the sky or ocean
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• (n.) An instrument for measuring degress of blueness.
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http://thinkexist.com/dictionary/meaning/cyanometer/
Cy`a·nom'e·ter noun [ Greek
ky`anos a dark blue substance +
-meter : confer French
cyanomètre .] An instrument for measuring degress of blueness.
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http://www.encyclo.co.uk/webster/C/209
The Cyanometer is an instrument invented by Saussure for ascertaining the intensity of colour in the sky. It consists of a circular piece of metal or pasteboard, with a band divided by radii into fifty-one portions, each of which is painted with a shade of blue, beginning with the deepest, not distinguishable from black, and decreasing gradually to...
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an instrument for measuring the amount and intensity of blue in light, as of the sky.
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https://www.infoplease.com/dictionary/cyanometer
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