An 18th-Century French lacquered-brass sector with hinge and stay to hold arms open, signed Langlois AParis aux Galleries du Louvre , calibrated for Les Cordes , Les Solides , Diametre et Poids des Boulets , Les Poligones , Les Plans and Calibre des Pieces , the hinge to hold the arms open at 90° graduated 45°-0-45° -- 18.1cm. (7 1/8in.) wide ; a lacquered-brass folding rule hinged to form a set square by the same maker, graduated with a scale of Demi pied de Roy , lignes and pounces , with a cut-out for plumb-bob and line -- 17.5cm. (6 7/8in.) wide ; and a lacquered-brass half-protractor by the same maker, graduated 0-180° in both directions (3)
An 18th-Century French lacquered-brass sector with hinge and stay to hold arms open, signed Langlois AParis aux Galleries du Louvre , calibrated for Les Cordes , Les Solides , Diametre et Poids des Boulets , Les Poligones , Les Plans and Calibre des Pieces , the hinge to hold the arms open at 90° graduated 45°-0-45° -- 18.1cm. (7 1/8in.) wide ; a lacquered-brass folding rule hinged to form a set square by the same maker, graduated with a scale of Demi pied de Roy , lignes and pounces , with a cut-out for plumb-bob and line -- 17.5cm. (6 7/8in.) wide ; and a lacquered-brass half-protractor by the same maker, graduated 0-180° in both directions (3)
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
