A Coffey still is a type of continuous still used to distill spirits such as whisky, rum, and cognac. The Coffey still is also known as the patent still, column still, or the continuous still. It was invented by Aeneas Coffey and was initially used for the distillation of Irish whiskey. The continuous still consists of two columns referred to as the analyzer and the rectifier, which work together to create a more potent spirit. Some other synonyms for the Coffey still include the columnar still, fractional still, and the continuous distillation apparatus. The Coffey still has become an important tool in the distillation process and continues to be used worldwide.