Varnished wooden disc with a glass covered magnetic compass in the centre forming a divining compass, luopan, for fengshui. Chinese inscription in black ink on the underside indicates the maker was Wu lu-heng Workshop of Xiuning county, Anhui, Xin-an province.
See Stephan Feuchtwang (1974) An Anthropological Analysis of Chinese Geomancy Vientiane: Editions Vithagna. Part Two 'The indigenous model' explains the significance of the several rings and the symbols in them.