whereissara

afterthetorchlight:

Horace-Bénédict de Saussure’s cyanometer, an instrument for measuring the blueness of the sky. c. 1760

Horace-Bénédict de Saussure’s cyanometer, an instrument for measuring the blueness of the sky. c. 1760

afterthetorchlight:

Horace-Bénédict de Saussure’s cyanometer, an instrument for measuring the blueness of the sky. c. 1760

Horace-Bénédict de Saussure’s cyanometer, an instrument for measuring the blueness of the sky. c. 1760