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Early English Theodolite

Auction:
2345
Lot:
99
Sold for:
$823$700

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Auction:
Clocks, Watches & Scientific Instruments - 2345
Location:
Boston
Date / Time :
July 29, 2006 10:00AM

Description:

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.
Estimate $600-800

Keywords

Benjamin Cole, blued-steel needle, Silvio Bedini, surveyor , Cartography, Cole, Qibla compass, Theodolite, Vernier, Switzerland