An ebony and brass octant, the index arm with framed vernier, tangent screw and clamp, bone scale divided 0°-95°, with double pin hole sight and backsight, two shades and mirrors, on three pillar tripod feet | Christie's

拍品 14

An ebony and brass octant, the index arm with framed vernier, tangent screw and clamp, bone scale divided 0°-95°, with double pin hole sight and backsight, two shades and mirrors, on three pillar tripod feet

細節

An ebony and brass octant, the index arm with framed vernier, tangent screw and clamp, bone scale divided 0°-95°, with double pin hole sight and backsight, two shades and mirrors, on three pillar tripod feet