A 19th c. Brass Double Telescope Graphometer Theodolite - French 1820-40 circa

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A 19th c. Brass Double Telescope Graphometer Theodolite - French 1820-40 circa:
$900.00

French brass Graphometer with double telescopes, from early 19th century. The instrument has a good patina with some oxide sports on the surface. Everything moves smoothly. Brass conical staff mount with swivel-ball on top and 4 blocking screws. 2 toric bubble levels for perfect plane position. Brass dial compass, finely engraved with silvered 360 degree scales. Blue steel compass needle. 2 scopes with lenses and crosshairs. Some dust on the lens.

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