Full-circle contact goniometer with detachable arms

 

unsigned
Full-circle contact goniometer (brass and steel, outside diameter 8.2 cm) with detachable arms in dark brown plush-lined leather-covered case (9.5 cm).
Unsigned, early 20th century.

private collection

Full-circle contact goniometer with detachable arms

Full-circle contact goniometer with detachable arms