(Berlin, Haude et Spener, 1769). 4to. No wrappers as issued in ""Memoires de l'Academie Royale des Sciences et Belles Lettres"". tome XVIII, 1762. With halftitle ""Classe de Mathematique"" (2) pp. + pp. 117-142. Clean and fine.
Reference : 48878
An original paper ( first printing) by Euler dealing with the mathematics of problems in the manufacturing of lenses.Enestroem: E 376.
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