An American-pattern oxidised brass transit theodolite, signed on the silvered compass dial Troughton & Simms, London and engraved on the horizontal tangent screw bracket Harrison & Co., Montreal Canada, Agents, the telescope with rack-and-pinion focusing, cross wire adjusters and graduated bubble level, the axis located on twin trunnions and supported by A-frames from the horizontal plate, the vertical half-circle with silvered scales divided in two quadrants (0°-80°) with vernier, the compass box with rack adjustment, the enclosed horizontal circle with silvered scale and twin verniers and reflectors, on four screw tripod mount, in fitted mahogany case, the base with leather cover -- 13½in.(34.3cm.) high