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There are 12 troy ounces per troy pound,[2] rather than 16 avoirdupois ounces (oz) in the avoirdupois pound (lb) as in the more common avoirdupois system. The avoirdupois pound is 147⁄12 (~14.583) troy ounces, since troy ounces are larger than avoirdupois ounces.
In Scotland the Incorporation of Goldsmiths of the City of Edinburgh used a system in multiples of sixteen. (See Assay-Master's Accounts, 1681-1702, on loan from the Incorporation to the National Archives of Scotland.) Thus there were 16 drops to the troy ounce, 16 (FIXME: ounces) to the troy pound, and 16 pounds to the troy stone. The Scots had several other ways of measuring precious metals and gems, but this was the common usage for silver and gold.
[edit] Conversions
Unit Grains Grams
Troy Pound (12 Troy ounces) 5,760 373.241 721 6
Troy Ounce (20 pennyweights) 480 31.103 476 8
Pennyweight 24 1.555 173 84
Grain 1 0.064 798 91
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