Still

Still is the apparatus used for distilling any liquid. It consists of a boiler (often of copper) in which is placed the liquid whose vapour is required. From the neck of the boiler leads a long tube, called the worm; this is generally coiled into a compact form, and kept in a vessel known as the refrigerator, through which cold water is constantly flowing. The vapour, rising into the neck of the boiler, beqomes condensed in the cooled worm, and flows from a tube at the bottom of the worm into the receiver. Stills used for distilling different liquids vary in details, but the principle of all is the same.