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Scientific American 1912-09-28

ScientificAmerican1912-09-28.jpg Scientific American 1901-11-09ThumbnailsScientific American 1917-02-03Scientific American 1901-11-09ThumbnailsScientific American 1917-02-03Scientific American 1901-11-09ThumbnailsScientific American 1917-02-03Scientific American 1901-11-09ThumbnailsScientific American 1917-02-03Scientific American 1901-11-09ThumbnailsScientific American 1917-02-03

Besson's Nephometer. A new instrument for measuring the cloudiness of the sky.



Artist:

Source: Steve Kirch, creator of a wonderful website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner