Chaulnes (Michel Ferdinand d'Albert) Nouvelle méthode pour diviser les instruments de mathématique et d'astronomie, first edition, [Paris, L. F. Delatours], 1768.

Chaulnes (Michel Ferdinand d'Albert) Nouvelle méthode pour diviser les instruments de mathématique et d'astronomie, first edition, 15 engraved plates, plates crudely stitched, contemporary marbled boards, light wear to spine ends, a little rubbed, preserved in custom drop-back box, [Tomash & Williams C75,] folio, [Paris, L. F. Delatours], 1768.

⁂ "In this work Chaulnes describes two dividing engines of his invention: one for dividing circles and the other for dividing linear scales. First published in the Description des Arts et Metiers, Volume 13, it appears here separately in a large format... The use of the Chaulnes machine eliminated the need for a highly skilled craftsman when creating precision scales. Chaulnes used microscopes of his own design (also described here) to read the divisions on his scales. He also incorporated a screw drive mechanism to move his engraving tool, and this was the first publication to present to that technique." - Erwin & Tomash.