細節
An ebony octant,
signed on ivory plaque F. & G.W. Blunt, New York, with brass arm, ivory scales and vernier and mahogany case -- radius 10¾in. (27.5cm.) (lacking peephole sight)
signed on ivory plaque F. & G.W. Blunt, New York, with brass arm, ivory scales and vernier and mahogany case -- radius 10¾in. (27.5cm.) (lacking peephole sight)