BENARD (18th), Encyclopedic articles on optics, Copper engraving Benard

BENARD (18th), Encyclopedic articles on optics, Copper engraving Benard (18th century): Two encyclopedic plates on the subject of optics with illustrations of light refraction, lens systems, and a reflecting telescope, 18th century, Copper engraving Technique: Copper engraving on paper Inscription: Signed in the printing plate at the lower right: "Benard Direx." Inscribed in the printing plate at the lower center: "Optique." Numbered in the printing plate at the upper right: "Suppl. Pl. 1.

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