拍品专文
See illustration on p.30
BY TROUGHTON AND SIMMS, LONDON, 19TH CENTURY
细节
an oxidize-brass theodolite
By Troughton and Simms, London, 19th Century
The telescope with rack and pinion focusing, lens cap, bubble level, with vertical half-circle and vernier, the horizontal circle with bubble-level turn verniers and clamp, on three-screw tripod mounting with tangent-screw fine adjustment
26.6cm. high
By Troughton and Simms, London, 19th Century
The telescope with rack and pinion focusing, lens cap, bubble level, with vertical half-circle and vernier, the horizontal circle with bubble-level turn verniers and clamp, on three-screw tripod mounting with tangent-screw fine adjustment
26.6cm. high