A rare 18th Century mahogany octant , signed on the engraved brass scale J. Uring's fecit , the frame with brass pin-hole sight, red, blue and green shades, mirrors, the index arm with vernier scale -- 19 3/8in (49.2 cm) radius, on three bun feet, the frame fitted with index arm stop See Colour Plate
A rare 18th Century mahogany octant , signed on the engraved brass scale J. Uring's fecit , the frame with brass pin-hole sight, red, blue and green shades, mirrors, the index arm with vernier scale -- 19 3/8in (49.2 cm) radius, on three bun feet, the frame fitted with index arm stop See Colour Plate
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
