拍品专文
Robert Neill is recorded as working from four different addresses in Belfast between 1805 and 1840
细节
An early 19th-Century vernier octant signed Neill, Belfast
constructed in ebony, ivory and brass, the inlaid ivory scale divided 2½°- 0°- 105°, vernier clamp and fine tangent screw adjustment, pin hole sight cover over telescope thread, complete with six shades, two mirrors, brass pin feet and wooden handle, radius -- 10in. (25.5cm.)
See illustration
constructed in ebony, ivory and brass, the inlaid ivory scale divided 2½°- 0°- 105°, vernier clamp and fine tangent screw adjustment, pin hole sight cover over telescope thread, complete with six shades, two mirrors, brass pin feet and wooden handle, radius -- 10in. (25.5cm.)
See illustration
出版
Clifton, G: Directory of British Scientific Instrument Makers 1550-1851, Zwemmer 1995