拍品专文
Martha Ayscough worked between 1759 and 1767 from Ludgate St, London having succeeded James Ayscough who worked from the same address between 1748 and 1759.
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细节
A fine mahogany, brass and ivory 17in. radius vernier octant by Ayscough, circa 1760
the inset scale divided 5- 0- 95, the vernier divided 10-0-10, signed in brass at the end of the index arm Ayscough London, cross bar with ivory plate inscribed Thomas Bay, ani 1760, two pin hole sights, two interchangeable shades, three mirrors and wood pin feet -- 19in. (48.2cm.) high
See illustration
the inset scale divided 5- 0- 95, the vernier divided 10-0-10, signed in brass at the end of the index arm Ayscough London, cross bar with ivory plate inscribed Thomas Bay, ani 1760, two pin hole sights, two interchangeable shades, three mirrors and wood pin feet -- 19in. (48.2cm.) high
See illustration