A rare oxidised and lacquered brass astronomical spectroscope signed Grubb & Son Dublin, with rack-and-pinion adjustment to telescope body tube, with vernier scale and micrometer adjustment on main mounting bracket arm, cylindrical drum prism housing, the eyepiece with adjustable cross hairs, secondary eyepiece with slit, micrometer adjustment and twin dust slides, in fitted mahogany case c.1868 - 14½in.(39.5)cm.wide

細節

A rare oxidised and lacquered brass astronomical spectroscope signed Grubb & Son Dublin, with rack-and-pinion adjustment to telescope body tube, with vernier scale and micrometer adjustment on main mounting bracket arm, cylindrical drum prism housing, the eyepiece with adjustable cross hairs, secondary eyepiece with slit, micrometer adjustment and twin dust slides, in fitted mahogany case c.1868 - 14½in.(39.5)cm.wide

出版

J.E.Burnett & A.D.Morrison-Low, Vulgar & Mechanick The Scientific Instrument Trade in Ireland 1650-1921 1989 p89-113

拍品專文

The Grubb family were important makers of astronomical instruments in the 19th Century. Howard Grubb (later Sir Howard) joined his father Thomas in 1865 and assisted in the production of a 48 inch Cassegrain reflector with metal speculum (1865-1868). In 1868 Thomas took over the firm and it is likely that this instrument dates from this period