System of measurement The same is true of quarts, gallons, etc. Six US gallons are a little less than five imperial gallons. The Avoirdupois system served as the general system of mass and weight. In addition to this there are the Troy and the Apothecaries' systems. Troy weight was customarily used for precious metals, black powder and gemstones. The troy ounce is the only unit of the system in current use; it is used for precious metals. Although the troy ounce is larger than its Avoirdupois equivalent, the pound is smaller. The obsolete troy pound was divided into 12 ounces, rather than 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