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Book VII: Ore Testing

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BOOK VII.                                          255
By the first eleven needles, when they are rubbed on the touchstone, we
test what proportion of gold a bar of silver contains, and with the remaining
thirteen we test what proportion of silver is in a bar of gold ; and also what
proportion of either may be in money.
Since some gold coins are composed of gold and copper, thirteen needles
of another kind are made as follows :—
Book VII: Ore Testing Page of 673 Book VII: Ore Testing
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