A late 18th Century ebony octant with bone scale and makers plaque stamped 'Made for Bartholomew Downing Oct 21, 1794' , with pin hole sight, three shades, back sight and mirrors, the index arm -- 13 5/8in. (34.5cm.) radius, engraved 'Owens, Liverpool' , bone vernier and clamp, with trade label, for 'Richard Patten, Instrument Maker, 180 Water Street, New York' inscribed 'All instruments in the above line made to order & warranted being divided on an Engine after the Plan of Ramsdens' , in stepped keystone case
A late 18th Century ebony octant with bone scale and makers plaque stamped 'Made for Bartholomew Downing Oct 21, 1794' , with pin hole sight, three shades, back sight and mirrors, the index arm -- 13 5/8in. (34.5cm.) radius, engraved 'Owens, Liverpool' , bone vernier and clamp, with trade label, for 'Richard Patten, Instrument Maker, 180 Water Street, New York' inscribed 'All instruments in the above line made to order & warranted being divided on an Engine after the Plan of Ramsdens' , in stepped keystone case
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
