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细节
A 19th Century training octant
with varnished mahogany frame, nickel plated brass scale broadly divided between 0- 110, simple vernier, pin hole sight, mirrors and turned handle -- 8in. (20.4cm.) radius
See illustration
with varnished mahogany frame, nickel plated brass scale broadly divided between 0- 110, simple vernier, pin hole sight, mirrors and turned handle -- 8in. (20.4cm.) radius
See illustration