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The troy pound is no longer in general use or legal unit for trade. In the United Kingdom, the use of the troy pound was abolished on 6 January 1879 by the WMA Weights and Measures Act of 1878, though the troy ounce was retained. The troy ounce is still used for measurements of precious metals such as gold, silver, and platinum, and sometimes gems such as opals.
Most measurements of the mass of precious metals using pounds refer to troy pounds, even though it is not always explicitly stated that this is the case. Some notable exceptions are:
- Encyclopædia Britannica which uses either avoirdupois pounds or troy ounces, likely never both in the same article, and
- the mass of Tutankhamun's sarcophagus lid. This is 110 kilograms. It is often stated to have been 242 or 243 avoirdupois pounds but sometimes, much less commonly, it is stated as 296 (troy) pounds.
- ↑ United States National Bureau of Standards. "Appendix C of NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, General Tables of Units of Measurement". p. C-12. http://ts.nist.gov/WeightsAndMeasures/Publications/upload/h4402_appenc.pdf.
- ↑ Cite error: Invalid
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