ScientificAmerican1912-09-28.jpg Popular Mechanics 1916-01ThumbnailsPopular Mechanics 1916-01ThumbnailsPopular Mechanics 1916-01ThumbnailsPopular Mechanics 1916-01ThumbnailsPopular Mechanics 1916-01Thumbnails
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