EULER, LEONHARD - ON COMPOUND OBJECT-GLASSES.

Sur les Avantages des Verres Objectifs composés de deux Verres simples. (On the advantages of telescopic glasses built with two lenses)

(Berlin, Haude et Spener, 1769). 4to. No wrappers, as issued in "Mémoires de l'Academie Royale des Sciences et Belles Lettres", Année 1762, tome XVIII, pp. 249-264 and 1 engraved plate.

First printing. In the paper Euler states the mathematical theory for compund object-glasses of different capabilities.

Enestroem: E. 381.

Order-nr.: 45124