An ebony framed octant, unsigned
With bone-ivory scale divided on Ramsden's engine showing the fouled anchor mark, with pin-hole fore and back sights, three shades and mirrors, the brass index arm with bone-ivory vernier
40.6cm. radius overall
An ebony framed octant, unsigned
With bone-ivory scale divided on Ramsden's engine showing the fouled anchor mark, with pin-hole fore and back sights, three shades and mirrors, the brass index arm with bone-ivory vernier
40.6cm. radius overall
