Winchester gallon

In England, 16th – 19th centuries, a unit of dry capacity used for grain, = 272.5 cubic inches. Sometimes called the “corn gallon.” The first Report of the Commissioners of Weights and Measures includes a list of towns using this measure in the early 19th century.

This value, set by ordinance, is not exactly 1/8th of the Winchester bushel, which the Report noted.

First Report of Commissioners appointed to consider the Subject of Weights and Measures 7 July 1819.
Parliamentary Papers (HC 565).

Appendix B.