an ebony framed octant
By Spencer Browning & Co, London
Signed and inscribed Made for J. Clark Greenock, with bone-ivory scale signed S.B.R., brass mounted with telescope socket, seven shades, mirrors, the index arm with bone-ivory vernier scale, tangent-screw fine adjustment and clamp - in keystone-shaped case
30.5cm. radius overall
an ebony framed octant
By Spencer Browning & Co, London
Signed and inscribed Made for J. Clark Greenock, with bone-ivory scale signed S.B.R., brass mounted with telescope socket, seven shades, mirrors, the index arm with bone-ivory vernier scale, tangent-screw fine adjustment and clamp - in keystone-shaped case
30.5cm. radius overall
