细节
A mid 19th Century vernier sextant by Spencer Browing & Rust
the oxcidised brass frame with polished brass arc signed (faintly) Spencer, Browning & Rust London, with inset silvered scale divided 5- 0- 150, vernier with fine scale adjustment and swivel magnifier, seven shades (one replaced) two mirrors, ebony handle (split), accessories in fitted mahogany box with flush handle and securing hooks, the radius -- 7in. (19cm.); the box -- 5 x 10in. (14 x 26.5cm.)
See illustration
the oxcidised brass frame with polished brass arc signed (faintly) Spencer, Browning & Rust London, with inset silvered scale divided 5- 0- 150, vernier with fine scale adjustment and swivel magnifier, seven shades (one replaced) two mirrors, ebony handle (split), accessories in fitted mahogany box with flush handle and securing hooks, the radius -- 7in. (19cm.); the box -- 5 x 10in. (14 x 26.5cm.)
See illustration