Plate 4, from Recueil d'ouvrages curieux de mathématique et de mécanique, ou description du cabinet de Monsieur Grollier de Servière, Etienne Joseph Daudet, French, 1672 - 1730, Gaspard Grollier de Seviere II, French, 1677 - 1745, Engraving on paper, Designs for mechanical objects to be carried out in metal or ivory. The central figure (12) is the largest, and like those in Plate 3, is spherical, but has more holes apparent. Inside are loose barrel-like shapes; figure 4, an indented sphere. Lower right, a quadrilateral triangle, with merging points. Lower left and righ, cubes., Lyon, France

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