Gallon (Scots)
The Scots gallon was a unit of liquid volume measurement that was in use in Scotland from at least 1661 – and possibly as early as the 15th century – until the late 19th century. It was approximately equivalent to 13.568 litres, or very roughly three times larger than the Imperial gallon that was adopted in 1824. A Scots gallon could be subdivided into eight Jougs, or into sixteen chopins.
An ale or beer barrel was 12 Scots gallons.