LAMBERT, JOHANN HEINRICH. - APPLIED PHOTOMETRICS.

Sur la Vitesse du Son. (+) Memoire sur la Partie Photometrique de L'Art du Peintre. (2 Papers).

(Berlin, Haude et Spener, 1770).

4to. No wrappers, as issued in "Mémoires de l'Academie Royale des Sciences et Belles Lettres", Année 1768, tome XXIV, pp. 70-79 a. pp. 80-108 a. Clean and fine.

First printing of both papers. In the paper on photometrics Lambert uses his photometric theories on the art of painting, and it has a long, remarkable discussion of the technics used by Leonardi da Vinci. - The first paper deals with the propagation of sound waves in different media.

Order-nr.: 46558