A fine lacquered brass transit theodolite signed Thomas Jones Charing Cross London the telescope with right angle eypiece on sliding plate, the 8 inch diameter vertical circle with silvered scale divided 10-360°, with triple vernier scale, wheel clamp, tangent screws, supported by twin connical trunnions, over the 9¼ inch diameter horizontal circle with graduated bubble level, silvered scale divided 10-360°, triple vernier scales, tangent screw and clamp on circular table mount, supported by three outer pillars and central tapered trunnion, with three levelling screws, early 19th Century - 17¼in high, in a substantial fitted mahogany carrying case with brass fittings

細節

A fine lacquered brass transit theodolite signed Thomas Jones Charing Cross London the telescope with right angle eypiece on sliding plate, the 8 inch diameter vertical circle with silvered scale divided 10-360°, with triple vernier scale, wheel clamp, tangent screws, supported by twin connical trunnions, over the 9¼ inch diameter horizontal circle with graduated bubble level, silvered scale divided 10-360°, triple vernier scales, tangent screw and clamp on circular table mount, supported by three outer pillars and central tapered trunnion, with three levelling screws, early 19th Century - 17¼in high, in a substantial fitted mahogany carrying case with brass fittings