The straitjacket, the bed, and the pill

The seat [. . .] consists of a sinkhole (a), a pot (b), discharge pipes (c) ventilation tubes (d). The whole device is covered up to the mouth of the sinkhole and the pot with wood; the pot is closed with a screwable tight lid. Sinkhole and pot are constructed like faïence tubes and have a wall thickness of 0.1’. [. . .] The inside diameter of the upper sinkhole measures 1.0’, the lower only 0.27’. ¹