The butt was a measure of liquid volume equalling two hogsheads. This equated to 108 imperial gallons (490 l) for ale or 126 imperial gallons (570 l) for wine (also known as a pipe), although the Oxford English Dictionary notes that "these standards were not always precisely adhered to".
- "Butt, n.2". Oxford English Dictionary.
- Ciphering made easy, or, An attempt to render simple and interesting the first four rules of arithmetic. 1833. p. 84. Retrieved 18 March 2016.
- Cardarelli, F. (2003). Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins. London: Springer. p. 34. ISBN 978-1-4471-1122-1.
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