LAMBERT, JOHANN HEINRICH.

Sur les Porte-Lumieres appliques a la Lampe. (And same author:) Observations sur l'Encre & le Papier.

(Berlin, C.F. Voss, 1772). 4to. Without wrappers, extracted from "Nouveau Mémoires de l'Academie Royale des Sciences et belles-Lettres", Année 1770, pp. 51-57 and pp. 58-67.

Both papers first edition. In the first paper the design of a new lamp is presented, modelled after Lambert's previous studies on the "porte-voix".
The second deals with ink and paperdegeneration. Because a lot of Lambert's manuscripts became unreadable through water damage during the time they were stored in Switzerland before being transported to Berlin, Lambert goes into the causes of ink and paper degeneration. Through experimentation he arrives at the kind of ink and paper that withstand humidity best.

Order-nr.: 39082