拍品专文
The mirror and shade surrounds and fore and aft sight are of later manufacture
BY J. GILBERT, TOWER HILL, LONDON, 1763
细节
a mahogany octant
By J. Gilbert, Tower Hill, London, 1763
With inset bone plaque inscribed Made by Ino Gilbert.on.Tower.Hill LONDON For Thos Hare.Augst 25:1763, with finely divided fruitwood scale, pinhole fore and aft sights, mirrors and four shades, the index arm with clamp screw, the frame with index arm stop and three stub feet
50.5cm. radius overall
By J. Gilbert, Tower Hill, London, 1763
With inset bone plaque inscribed Made by Ino Gilbert.on.Tower.Hill LONDON For Thos Hare.Augst 25:1763, with finely divided fruitwood scale, pinhole fore and aft sights, mirrors and four shades, the index arm with clamp screw, the frame with index arm stop and three stub feet
50.5cm. radius overall