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Irish gold pistole, bearing its weight (4 dwt 7 gr) (National Museum of Ireland – Decorative Arts and History). A pennyweight (dwt) is a unit of mass equal to 24 grains, 1 ⁄ 20 of a troy ounce, 1 ⁄ 240 of a troy pound, approximately 0.054857 avoirdupois ounce [1] and exactly 1.55517384 grams. [2]
The tael is a legal weight measure in Hong Kong, and is still in active use. [2] In Hong Kong, one tael is 37.799364167 g, [ 2 ] and in ordinance 22 of 1884 is 1 + 1 ⁄ 3 oz. avoir. Similar to Hong Kong, in Singapore, one tael is defined as 1 + 1 ⁄ 3 ounce and is approximated as 37.7994 g [ 3 ]
Troy weight is a system of units of mass that originated in the Kingdom of England in the 15th century [1] and is primarily used in the precious metals industry. The troy weight units are the grain , the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces).
The grain was the legal foundation of traditional English weight systems, [5] and is the only unit that is equal throughout the troy, avoirdupois, and apothecaries' systems of mass. [6]: C-6 The unit was based on the weight of a single grain of barley which was equal to about + 4 ⁄ 3 the weight of a single grain of wheat.
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In Homer's poems, it is always used of gold and is thought to have been quite a small weight of about 8.5 grams (0.30 oz), approximately the same as the later gold stater coin or Persian daric. In later times in Greece, it represented a much larger weight, approximately 3,000 times as much: an Attic talent was approximately 26.0 kilograms (57 ...
Gold fineness in carats comes from carats and grains of gold in a solidus of coin. The conversion rates 1 solidus = 24 carats, 1 carat = 4 grains still stand. [16] Woolhouse's Measures, Weights and Moneys of All Nations [17] gives gold fineness in carats of 4 grains, and silver in troy pounds [17] of 12 troy ounces of 20 pennyweight each.
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