細節
SPENCER, BROWNING & RUST, London
An ebony octant, with ivory scale with S.B.R. monogram, the frame with telescope, six shades and mirrors, the index arm with vernier and tangent screw adjustment -- 11¾in (29.8 cm) radius, in shaped mahogany case
An ebony octant, with ivory scale with S.B.R. monogram, the frame with telescope, six shades and mirrors, the index arm with vernier and tangent screw adjustment -- 11¾in (29.8 cm) radius, in shaped mahogany case