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Title: Pouillet's Pyrheliometer.
Caption: Engraving depicting Pouillet's Pyrheliometer, used to measure the amount of solar heat reaching the earth's surface. Claude Pouillet (1790-1868) a French physicist and a professor of physics at the Sorbonne and member of the French Academy of Sciences. Dated 19th Century.
Credit: Album / Universal Images Group / Universal History Archive \ UIG
Image size: 4182 × 5015 px | 60.0 MB
Print size: 35.4 × 42.5 cm | 1646.5 × 1974.4 in (300 dpi)