An oxidised brass surveying theodolite by Troughton and Simms London with graduated bubble level, the telescope with lens, rack and pinion focusing and dust cover in cradle over vertical half circle, with vernier scale on two A frame supports with bubble and cross bubble, with compass edge-bar needle and cap, the horizontal circle with tangent screw and clamp, twin vernier scale over four screw tripod mount in fitted mahogany case, 19th Century -12in.wide