A 19th-Century French lacquered-brass protractor with radius arm
A 19th-Century French lacquered-brass protractor with radius arm, signed Secretan à Paris , graduated 1-360°, the radius arm with screw-adjustment and vernier scale 0-30°, in a mahogany case with maker's label MAISON LEREBOURS & SECRETAN - SECRETAN, SUCCESSEUR - Opticien de L'Observatoire & de la Marine - MAGASINS: 13, PLACE DU PONT-NEUF - ATELIERS: 28, PLACE DAUPHINE - PARIS -- 48cm. (18 7/8in.) wide ; and three 18th-Century lacquered-brass half-protractors signed Baradelle AParis, Lennel à La Sphère à Paris and Butterfield AParis , each graduated 1-180° in both directions (4)
A 19th-Century French lacquered-brass protractor with radius arm
A 19th-Century French lacquered-brass protractor with radius arm, signed Secretan à Paris , graduated 1-360°, the radius arm with screw-adjustment and vernier scale 0-30°, in a mahogany case with maker's label MAISON LEREBOURS & SECRETAN - SECRETAN, SUCCESSEUR - Opticien de L'Observatoire & de la Marine - MAGASINS: 13, PLACE DU PONT-NEUF - ATELIERS: 28, PLACE DAUPHINE - PARIS -- 48cm. (18 7/8in.) wide ; and three 18th-Century lacquered-brass half-protractors signed Baradelle AParis, Lennel à La Sphère à Paris and Butterfield AParis , each graduated 1-180° in both directions (4)
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
