(Berlin, Haude et Spener, 1769) 4to. No wrappers, as issued in "Mémoires de l'Academie Royale des Sciences et Belles-Lettres", tome XVIII, Année 1762. Pp. 195-225 and 1 folded engraved plate. + Pp. 226-248.
First printing of two importent Euler-papers on the mathematical theory of dioptrics, and how to avoid the confusions of lenses. - Eneström E 379 a. 380.
Order-nr.: 44803