@futurebird @u0421793 @ninawillburger I think because the base unit is actually the hogshead, and a quarter cask is a quarter of a hogshead. The tierce and the British barrel are undersized attempts at a unit barrel. If I remember my barrel lore from my time on the USS Constitution correctly ( I may not be.)
https://mastodon.social/@whknott/113612532843699486
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