Comparison of the imperial and US customary measurement systems metre, as 1852 metres. Traditionally, both Britain and the US used three different weight systems: troy weight for precious metals, avoirdupois weight for most other purposes and apothecaries' weight for medicines. However, apothecaries' weight has now been superseded by the metric system. One important difference is the widespread use in Britain of the stone of 14 pounds () for body weight. This unit is not used in the United States, although its influence was seen in the practice, until World War II, of selling flour by a barrel of 196 pounds (14 stone). Another difference arose when Britain abolished the
Cross of Gold speech proposed a monetary system based on bimetallism, in which the new currency would be equal to a given amount of gold, or a larger amount of silver; at the time a given weight of gold was worth about 15 times as much as the same amount of silver. Although Hamilton understood that adjustment might be needed from time to time as precious metal prices fluctuated, he believed that if the nation's unit of value were defined only by one of the two precious metals used for coins, the other would descend to the status of mere merchandise, unusable as a