Editing Pound (mass) (section)

==== Troy pound ====
{{main|Troy weight}}

A troy pound (abbreviated lb t<ref>Capotosto, R. (1983). 200 Original Shop Aids and Jigs for Woodworkers. Sterling Publishing Company, Inc.</ref>) is equal to 12 [[troy ounce]]s and to 5,760 grains, that is exactly {{val|373.2417216}} grams.<ref>{{cite web| url=https://www.nist.gov/pml/wmd/pubs/upload/AppC-12-hb44-final.pdf| author=United States National Bureau of Standards | title=Appendix C of NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, General Tables of Units of Measurement| page=C-14}}</ref><!--Source uses U+002D Hyphen-Minus in page number and it should not be changed to n-dash. --> Troy weights were used in England by jewellers. Apothecaries also used the troy pound and ounce, but added the drachms and scruples unit in the [[apothecaries' system]] of weights.

[[Troy weight]] may take its name from the French market town of [[Troyes]] in France where English merchants traded at least as early as the early 9th century.<ref name="zupko" /> The troy pound is no longer in general use or a legal unit for trade (it was abolished in the United Kingdom on 6 January 1879 by the [[Weights and Measures Act 1878]]), but the troy ounce, {{frac|1|12}} of a troy pound, is still used for measurements of gems such as opals, and precious metals such as silver, platinum and particularly gold.<ref>[https://www.fiscal.treasury.gov/fsreports/rpt/goldRpt/current_report.htm "Status Report of U.S. Government Gold Reserve"] {{Webarchive|url=https://web.archive.org/web/20151003044818/https://www.fiscal.treasury.gov/fsreports/rpt/goldRpt/current_report.htm |date=3 October 2015 }}, Bureau of the Fiscal Service</ref>