An old English unit of mass or weight for butter, equal to 84 pounds (38.10 kilograms). In Newfoundland, a tub of coal was formerly equal to 100 pounds
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}