Contact goniometer hinged at the 90° graduation

Duboscq, Paris
Contact goniometer hinged at the 90° graduation (brass, outside diameter 10.8 cm) in red plush-lined leather-covered case (14.5 cm wide). The scale is finely divided (0.5 degree).
Signed inside the case "Jules Dubocq [sic] à Paris", second half 19th century.
Jules Duboscq (1817-1886) was the son-in-law and the successor of Soleil.

private collection