The 9th needle of 15 duellae
of silver and 9 duellae of
gold.
The 10th needle of 14 duellae
of silver and 10 duellae of
gold.
The 11th needle of 13 duellae
of silver and 11 duellae of
gold.
The 12th needle of 12 duellae
of silver and 12 duellae of
gold.
The 13th needle of 11 duellae
of silver and 13 duellae of
gold.
The 14th needle of 10 duellae
of silver and 14 duellae of
gold.
The 15th needle of 9 duellae
of silver and 15 duellae of
gold.
The 16th needle of 8 duellae
of silver and 16 duellae of
gold.
The 17th needle of 7 duellae
of silver and 17 duellae of
gold.
The 18th needle of 6 duellae
of silver and 18 duellae of
gold.
The 19th needle of 5 duellae
of silver and 19 duellae of
gold.
The 20th needle of 4 duellae
of silver and 20 duellae of
gold.
The 21st needle of 3 duellae
of silver and 21 duellae of
gold.
The 22nd needle of 2 duellae
of silver and 22 duellae of
gold.
The 23rd needle of 1 duellae
of silver and 23 duellae of
gold.
The 24th needle of pure gold
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.
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:—
of another kind are made as follows:—