The Act defined the proportional value of gold and silver as 15 units of pure silver to 1 unit of pure gold. Standard gold was defined as 11 parts pure gold to one part alloy composed of silver and copper. Standard silver was defined as 1485 parts pure silver to 179 parts copper alloy. The Act also specified the dollar as the "money of account" of the United States, and directed that all accounts of the federal government be kept in dollars, "dismes", cents, and "milles", a mille being one-tenth of a cent or one-thousandth of a dollar. The silver content of a dollar under this act was almost exactly equal to 1/5 of the silver content of the contemporary British pound sterling, or 4 British shillings.