Concentric-sphere Bed Censer
Ming Dynasty
H: 12 cm, body d : 12. 8 cm. Copper. Hollow sphere divided into two halves. Inside are two concentric spheres mounted on bearings and holding an incense receptor. As the outer ball rotates, the incense receptor remains level. This censer, used inside bed quilts to fumigate and disinfect them, was also called a "quilt censer." (Collection of Museum for History of Medicine, Shanghai University of TCM.)