ScientificAmerican1912-09-28.jpg Mechanics and Handicraft 1938-09ThumbnailsMechanics and Handicraft 1938-09ThumbnailsMechanics and Handicraft 1938-09ThumbnailsMechanics and Handicraft 1938-09ThumbnailsMechanics and Handicraft 1938-09Thumbnails
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