細節
An early 19th-Century vernier sextant signed Hughes, London
constructed in ebony, ivory and brass, the inlaid ivory scale divided 2½°- 0°- 137½°, vernier clamp and fine tangent screw adjustment complete with seven shades, telescope, wooden handle and brass feet -- radius -- 9in. (23cm.)
See illustration
constructed in ebony, ivory and brass, the inlaid ivory scale divided 2½°- 0°- 137½°, vernier clamp and fine tangent screw adjustment complete with seven shades, telescope, wooden handle and brass feet -- radius -- 9in. (23cm.)
See illustration