Troy Weight
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Troy weight is a system of units of mass customarily used for precious metals, black powder, and gemstones.
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Miscellaneous Math ToolsSource
Encyclopaedia Britannica (11th ed., vol. 28) (New York, NY: The Encyclopaedia Britannica Company, 1910)
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1281×2400, 1.2 MiB
546×1024, 158.2 KiB
341×640, 82.7 KiB
170×320, 26.4 KiB