Chaldron

A chaldron (also chauldron or chalder) was an English measure of dry volume, mostly used for coal; the word itself is an obsolete spelling of cauldron. It was used from the 13th century onwards, nominally until 1963 when it was abolished by the Weights and Measures Act 1963 but in practice until the end of 1835 when the Weights and Measures Act of that year specified that thenceforth coal could only be sold by weight.