Astronomy, Instrumens. Quart de Cercle Mural, Machine to train the Limbe, Astronomy, space in which a quadrant was built, Signed: Benard Direx, Pl. 12, after p. 14, Benard (dir.), Denis Diderot; M. d'Alembert: Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métierss, des arts et des métiers. Genève: chez Pellet, MDCCLXXVIII [1778

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Astronomy, Instrumens. Quart de Cercle Mural, Machine to train the Limbe, Astronomy, space in which a quadrant was built, Signed: Benard Direx, Pl. 12, after p. 14, Benard (dir.), Denis Diderot; M. d'Alembert: Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métierss, des arts et des métiers. Genève: chez Pellet, MDCCLXXVIII [1778]

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