![]() Before that time, various sorts of troy ounces were in use on the continent. (1824 was the year the British Imperial system of weights and measures was adopted, 1707 was the year of the Act of Union which created the Kingdom of Great Britain.) Troy ounces have been used in England since about 1400 and the English troy ounce was officially adopted for coinage in 1527. ![]() The British Imperial troy ounce (known more commonly simply as the imperial troy ounce) was based on, and virtually identical with, the pre-1824 British troy ounce and the pre-1707 English troy ounce. The troy ounce in use today is essentially the same as the British Imperial troy ounce (1824–1971), adopted as an official weight standard for United States coinage by Act of Congress on May 19, 1828. The British Imperial system of weights and measures (also known as Imperial units) was established in 1824, prior to which the troy weight system was a subset of pre-Imperial English units. Troy weights were first used in England in the 15th century, and were made official for gold and silver in 1527. ![]() Their values varied from one another by up to several percentage points. Before the adoption of the metric system, many systems of troy weights were in use in various parts of Europe, among them Holland troy, Paris troy, etc. One twelfth of an aes grave was called an uncia, or in English, an "ounce". An aes grave ("heavy bronze") weighed one pound. Before they used coins, early Romans used bronze bars of varying weights as currency. Many aspects of the troy weight system were indirectly derived from the Roman monetary system. Troy weight referred to the tower system the earliest reference to the modern troy weights is in 1414. Watson finds the dialect word troi, meaning a balance in Wright's The English Dialect Dictionary. Ĭharles Moore Watson (1844–1916) proposes an alternative etymology: The Assize of Weights and Measures (also known as Tractatus de Ponderibus et Mensuris), one of the statutes of uncertain date from the reign of either Henry III or Edward I, thus before 1307, specifies " troni ponderacionem"-which the Public Record Commissioners translate as "troy weight". The name troy is first attested in 1390, describing the weight of a platter, in an account of the travels in Europe of the Earl of Derby. Troy weight probably takes its name from the French market town of Troyes where English merchants traded at least as early as the early 9th century. One troy ounce (oz t) equals exactly 31.1034768 grams. ![]() The troy grain is equal to the grain unit of the avoirdupois system, but the troy ounce is heavier than the avoirdupois ounce, and the troy pound is lighter than the avoirdupois pound. The troy weight units are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces). Troy weight is a system of units of mass that originated in 15th-century England, and is primarily used in the precious metals industry. A Good Delivery silver bar weighing 1,000 troy ounces (83 troy pounds 31 kg) ![]()
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