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LARGE HADLEY' S QUADRANT, Signed G. Heath Ca. 1850

A large mid 19th century octant.
The octant is made by the English manufacturer G. Heath of London.
Ivory scale division from 0 to 90 degrees.
The octant has two small and one large mirror with various bilge glasses.
Frame length is an impressive 46 cm. with nicely decorated index arm with a supporting ivory scale division.
On the index arm there are recognizable engravings that were common in times of war, like banners, drums and a halberd.
Nice big instrument complete with bone table at the back and matching pencil in ivory cover. Big stepped oak case in shape of a quarter circle.

ITEM : 154

EBONY WOOD OCTANT CA. 1840

Very refined octant from ebony wood, made by Stephen Winckworth Silver.
Nice execution with two sets of coloured glasses and prism viewer.
Angle measurement up to 90 degrees, ivory scale division and venier.
Nice original mahogany wood chest with a lot of patina.
Length alidade: 30.5 cm (12 inches)
Great quality and very smooth.

SOLD TO THE USA

CIRCLE FRAME SEXTANT OBSERVATOR ROTTERDAM

Dutch circle frame sextant, made by the Observator company of Rotterdam.
Platinum scale division and venier, scale from 0 to 120 degrees.
Executed with two sets of coloured glasses and telescope.
Nice mahogany wooden carrying case, complete with eye cap, brush and adjusting pin for the mirrors.
Complete with test certificate from the Royal Dutch Meteorological Institute.
Good quality and complete execution.
Early 20th century, registration number: 2811.
Hardly any traces of wear.

SOLD

A JOHN CRICHTON HADLEY’ S QUADRANT, CIRCA 1830

A very fine large ebony octant by John Crichton of London.
Ivory scale and vernier, fore and back sights and a set of three
coloured filters.
Suitable for angle measurements from 0 to 90 degrees.
Nice big original stepped oak case in shape of a quarter circle.
14 inch (36) cm radius.
On the inside a nice vignette and trademark of S. Thaxten & Son of Boston.

SOLD