ScientificAmerican1912-09-28.jpg Scientific American 1912-09-21ThumbnailsScientific American 1912-10-05Scientific American 1912-09-21ThumbnailsScientific American 1912-10-05Scientific American 1912-09-21ThumbnailsScientific American 1912-10-05Scientific American 1912-09-21ThumbnailsScientific American 1912-10-05Scientific American 1912-09-21ThumbnailsScientific American 1912-10-05

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