29th Apr, 2009 12:00
Maritime and Scientific Models, Instruments & Art ('Popham)
210
[M] AN EARLY 19TH-CENTURY EBONY 11½IN. RADIUS...
AN EARLY 19TH-CENTURY EBONY 11½IN. RADIUS VERNIER OCTANT
the ivory scale divided to 100° on Ramsden's dividing engine (foul anchor mark to centre), braced index arm, interchangeable shades, pinhole sights, pencil and note plaque behind, contained within a fitted keystone case with mid-19th century trade label for R.M. Barrett over an earlier example in lid -- 15in. (38cm.) diameter
Estimated at £400 - £600
the ivory scale divided to 100° on Ramsden's dividing engine (foul anchor mark to centre), braced index arm, interchangeable shades, pinhole sights, pencil and note plaque behind, contained within a fitted keystone case with mid-19th century trade label for R.M. Barrett over an earlier example in lid -- 15in. (38cm.) diameter
AN EARLY 19TH-CENTURY EBONY 11½IN. RADIUS VERNIER OCTANT
the ivory scale divided to 100° on Ramsden's dividing engine (foul anchor mark to centre), braced index arm, interchangeable shades, pinhole sights, pencil and note plaque behind, contained within a fitted keystone case with mid-19th century trade label for R.M. Barrett over an earlier example in lid -- 15in. (38cm.) diameter
the ivory scale divided to 100° on Ramsden's dividing engine (foul anchor mark to centre), braced index arm, interchangeable shades, pinhole sights, pencil and note plaque behind, contained within a fitted keystone case with mid-19th century trade label for R.M. Barrett over an earlier example in lid -- 15in. (38cm.) diameter
Auction: Maritime and Scientific Models, Instruments & Art ('Popham), 29th Apr, 2009
