To modify your purchase order,
contact the auction house.
Brass graphometer with alidade (or surveying semicircle), graduated from 0 to 180 degrees Manufacturer’s signature: “Rochette Jeune au Griffon, Quai de l’Horloge, Paris,” monogrammed “PC” and numbered 1692 Approx. 17.5 x 23.5 x 11.5 cm (with the shell-shaped knee upright)