Traitté d'horlogiographie, contenant plusieurs manières de construire sur toutes surfaces, toutes sortes de lignes horaires: & autres cercles de la sphère ...
A 1641 French treatise on sundial construction by Pierre de Sainte Marie Magdeleine, published by Melchior Tavernier in Paris for instrument makers, surveyors and astronomers. Its plates show sundial layouts drawn as precise geometric diagrams of hour lines, meridians and dial faces, with numbered ruled lines radiating from a central gnomon, a useful reference for radial grids, clock-face geometry and technical line work.
