Lot Essay
See illustration
Details
an ebony framed octant, unsigned
With bone-ivory scale divided on Ramsden's engine showing the fouled anchor mark, with pin-hole fore and aft sights, three shades and mirrors, with lacquered-brass fittings, bone-ivory vernier scale, tangent-screw fine adjustments and clamp
35.6cm. radius overall
With bone-ivory scale divided on Ramsden's engine showing the fouled anchor mark, with pin-hole fore and aft sights, three shades and mirrors, with lacquered-brass fittings, bone-ivory vernier scale, tangent-screw fine adjustments and clamp
35.6cm. radius overall