Horace-Bénédict se Saussure’s cyanometer, and instrument for measuring the blueness of the sky. (discovered via Vic)
Horace-Bénédict se Saussure’s cyanometer, and instrument for measuring the blueness of the sky. (discovered via Vic)
There is just something both painful and clever in the idea of trying to define the exact shade of the sky. Can one have...