細節
A mid 19th-Century Scottish brass theodolite,
signed S.P. Cohen, Glasgow, the 9-inch long barrel with bubble level, rack and pinion focusing and cross-hair adjustment screws, raised with clamp, fine-screw adjustment and vernier arm on two A-frame supports, the base of one incorporating a 65°-0-50° scale, the 5-inch horizontal circle with glazed compass with edgebar needle and clamp, bubble level, chamfered circumference scale and twin verniers, finescrew adjustment and clamp, raised on a four-screw tripod mounting, with four leg extensions, in a fitted mahogany carrying case -- 31cm. (12¼in.) wide
See Illustration