OZANAM (Jacques). La Gnomonique, ou l'on donne par un principe général la maniere de faire des Cadrans sur toutes sortes de surfaces, & d'y tracer les heures Astronomiques, Babiloniennes & Italiques, les Ars des Signes, les Cercles des Hauteurs, les Verticaux & les autres Cercles de la Sphere. Paris: Claude Jombert, 1711. - In-8, 186 x 120: (1 f.), 182 pp, (5 ff.), 30 plates. Brown calf, spine ribbed and spotted (contemporary binding). Rare first separate edition of this treatise on gnomonics, taken from the Cours de mathématique published by the mathematician Jacques Ozanam (1640-1718) in 1693. It is illustrated with 30 copper-engraved plates. Lacks the headpieces, significant wear rubbing, dull corners, splits at the hinges. Light stain on bottom of title. Provenance: P. Ergo, with handwritten bookplate dated 1727 on the first endpaper. Attached, by the same author: - La Gnomonique... Paris : Charles-Antoine Jombert, 1746. - In-8, 192 x 122 : (8 ff.), 182 pp., (1 f.), 30 plates. Marbled calf, spine ribbed and decorated, red edges (contemporary binding). New edition, illustrated with 30 copper-engraved plates. A copy in a contemporary binding, from the library of Grand-Homme fils, a watchmaker and jeweller from Versailles in the 19th century. Missing headpieces, rubbing and spotting, dull corners, halo on first cover. Provenance: Louis Marie Marmayou, with handwritten bookplate on the title, dated 1770. - Grand-Homme fils, with autograph stamp and signature.