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Details
An early 19th-Century lacquered-brass surveying theodolite,
signed on the base plate J. Davis Cheltenham, the telescope with rack and pinion focusing to the object glass, fitted with a bubble level and mounted on a limb frame by two pins (one missing), the axis incorporating the vertical half-circle finely divided on both sides through three-quarters of its length on one side 90-0-50, on the other 30-0-30 in uneven spacing, raised over the horizontal base plate with finely engraved silver compass divided in four quadrants and further graduated 0-360°, with edge-bar needle and clamp, the plate with horizontal chamfered scale with single vernier and stadia line, with rack and pinion adjustment, raised on stub mounting for tripod or staff, in original mahogany carrying case with trade label for JOHN DAVIS OPTICIAN Mathematical & Philosophical INSTRUMENT MAKER, 171, High St. CHELTENHAM (case repaired, part of lid missing) -- 14¼in. (36.2cm.) wide
See Colour Illustration
signed on the base plate J. Davis Cheltenham, the telescope with rack and pinion focusing to the object glass, fitted with a bubble level and mounted on a limb frame by two pins (one missing), the axis incorporating the vertical half-circle finely divided on both sides through three-quarters of its length on one side 90-0-50, on the other 30-0-30 in uneven spacing, raised over the horizontal base plate with finely engraved silver compass divided in four quadrants and further graduated 0-360°, with edge-bar needle and clamp, the plate with horizontal chamfered scale with single vernier and stadia line, with rack and pinion adjustment, raised on stub mounting for tripod or staff, in original mahogany carrying case with trade label for JOHN DAVIS OPTICIAN Mathematical & Philosophical INSTRUMENT MAKER, 171, High St. CHELTENHAM (case repaired, part of lid missing) -- 14¼in. (36.2cm.) wide
See Colour Illustration