(Berlin: Haude & Spener, 1756) 4to. No wrappers as extracted from 'Mémoires de l'Academie Royale des Sciences et Belles Lettres', Bd. X, pp. 131-172 a. 1 engraved plate.
Reference : 41899
A main paper on atmospheric refraction, and Euler's earliest on the subject. He treats the subject mathematically and relates refraction to the density of the air, given the relevant formulas. - Enestroem E 219.
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