Negretti & Zambra Large Double Sextant, London, early 19th century, lacquered brass double-sided 5-in. dia. instrument each side consisting of a silvered scale calibrated 0-180, vernier, magnifier, index and horizon mirrors and accompanying knurled adjustment knobs, a 4-in. scope that extends to 6-in. with rotating solar filters, engraved on one side Negretti & Zambra, London, and a folding rosewood handle, all housed in a fitted mahogany case.
Negretti & Zambra Large Double Sextant, London, early 19th century, lacquered brass double-sided 5-in. dia. instrument each side consisting of a silvered scale calibrated 0-180, vernier, magnifier, index and horizon mirrors and accompanying knurled adjustment knobs, a 4-in. scope that extends to 6-in. with rotating solar filters, engraved on one side Negretti & Zambra, London, and a folding rosewood handle, all housed in a fitted mahogany case.
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.jpg "Quelle: Christie's")
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