The tool referred to as "usal," described by the 9th-century scholar Abu Bakr al-Razi in his book "Kitab el-Esrar ve Sırr el-Esrar," facilitated the sublimation of dry substances. This tool was described by Al-Harizmi in the second half of the 10th century as a device made either of glass or clay.
In the Latin version of the book by the 9th-century scholar Abu Bakr al-Razi, a funnel without a beak is depicted.
This alembic is known by the name "Alembic Cöcum," derived from Arabic. It exhibits specific differences from the tools in the sublimation series. This tool is called "karʿa" and "enbîk" (inbîk) in Arabic. The product is collected in the channel of the "blind" helmet.