Traité des lignes du premier genre, expliquées par une methode nouvelle & facile
A French geometry treatise by Jacques Ozanam, published in Paris by Estienne Michallet in 1687 for students and readers of mathematics. The plates are engraved line diagrams — circles with inscribed chords and triangles, parabolas, ellipses and hyperbolas with axes and tangents — labelled with letters and figure numbers, usable as fine-line linework, layout grids, or period mathematical ornament.
