Early English Theodolite, possibly by Benjamin Cole with four-inch silvered dial, rose with central flower roundel and eight plain, hatched and foliate-engraved points, needle ring with divisions in individual degrees 0-360, blued-steel needle with periphery-set brass lifting arm, compass box with vernier rotating around horizontal circle, and detachable vertical half-circle with vernier divided 90-0-90°, the yoke supporting 9-inch lg. telescope with vial, in fitted dovetailed mahogany box. Literature: Silvio Bedini, (1975), Thinkers and Tinkers, fig. 24, for an mid-18th century painting of a surveyor using a Cole-type theodolite.
Early English Theodolite, possibly by Benjamin Cole with four-inch silvered dial, rose with central flower roundel and eight plain, hatched and foliate-engraved points, needle ring with divisions in individual degrees 0-360, blued-steel needle with periphery-set brass lifting arm, compass box with vernier rotating around horizontal circle, and detachable vertical half-circle with vernier divided 90-0-90°, the yoke supporting 9-inch lg. telescope with vial, in fitted dovetailed mahogany box. Literature: Silvio Bedini, (1975), Thinkers and Tinkers, fig. 24, for an mid-18th century painting of a surveyor using a Cole-type theodolite.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
