18th century instrument to determine the sky's 'blueness' called a Cyanometer: The simple device was invented in 1789 by Swiss phys #pantone #gradient

    18th century instrument to determine the sky's 'blueness' called a Cyanometer: The simple device was invented in 1789 by Swiss phys #pantone #gradient

    From Freeasabee.tumblr.com

    #19161c #25355a #5d769c #ccccc7 #fefdfd

    Jerod Barker Saved to Fr8_Infographics & Data Visualizations