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$Jean-Sylvain Bailly - Saturn's Ring, Micrometer and Optics Diagrams - Folio Engraving (c. 1780): Plate II is a folding copperplate engraving from Jean-Sylvain Bailly's history of astronomy, signed "de la Gardette Sculp.". It combines diagrams of vision through the eye (Fig. 9), refraction (Fig. 1$