拍品专文
The scales for laying out polygons in the field is an unusual feature. An unsigned graphometer in Oxford (Inv. no. 47,382) bears a similar scale.
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PIERRE SEVIN, PARIS, FL.1662-1685
细节
A FRENCH MILITARY GRAPHOMETER
PIERRE SEVIN, PARIS, FL.1662-1685
signed to the throne P SEVIN A PARIS, 16-point compass rose, decorated by two engraved dolphins, double degree scale 0°-180°with blued steel sights, scale for polygons 20-4-20, brass alidade, in an associated wooden case.
8in. (20.5cm.) wide
PIERRE SEVIN, PARIS, FL.1662-1685
signed to the throne P SEVIN A PARIS, 16-point compass rose, decorated by two engraved dolphins, double degree scale 0°-180°with blued steel sights, scale for polygons 20-4-20, brass alidade, in an associated wooden case.
8in. (20.5cm.) wide