Copper gold-plated proportional gauge

[Copper gold-plated scale gauge]

Copper gold-plated geometric scale gauge, made by the Qing Palace Building Office, was 33.3 cm long, 6.2 cm wide and 0.7 cm thick during the Kangxi period of the Qing Dynasty. The old collection of the Qing Palace
This scale is made of copper-plated gold with flat feet and packed in wooden black lacquer box. The two arms of the scale are engraved with Chinese characters such as “dodecahedron”, “icosahedron”, “sphere”, “octahedron”, “circle”, “tetrahedron”, “tangent”, “bodies in the sphere”, and different scales such as bisection, sine, and facet. It is one of the drawing tools of the Qing Palace