Contact goniometer hinged at the 90degree graduation

Pixii, Paris
Contact goniometer hinged at the 90° graduation (brass with silvered scale and steel, outside diameter 9.5 cm) in green velvet lined and red Morocco leather-covered case (12.5 cm wide) with two brass hooks. Signed (on the back side) "Pixii, Neveu et Sr. de Dumotiez | Rue du Jardinet, N° 2 à Paris", ca. 1820

private collection