Geojungki, Crane Pulley

Crane, a construction machine devised to build the Hwaseing Fortress, was completed using the sheave wheel, a fixed pulley and the turning wheel, a fixed pulley based on explanatory diagrams of equipment of scholar Jeong Yakyong of Joseon Dynasty. The biggest characteristic of this crane is a complex pulley with introduction of a moving pulley, not only with a fixed pulley.