Chaulnes, Duc de [= Michel-Ferdinand dâÇÖAlbert dâÇÖAilly, duc de Chaulnes] — Description d'un microscope et de différents micromètres destinés à mesurer des parties circulaires ou droites, avec la plus grande précision.

1768 18 p., 6 engraved plates, folio (ca. 30 x 46 cm), loose, unbound (no covers). Uncut copy with large margins of this work describing and depicting a microscope and several measuring devises (micromètres). The Duc de Chaulnes was a member of the âǘâÇÖAcadémie des SciencesâÇÖâÇÖ, interested in physics, mechanics and especially optics and this paper is one the works he wrote on this subject. He died the year after the publication of this paper.