Agricola, Georgius - De re metallica

Agricola, Georgius, De re metallica, 1912/1950

Table of figures

[Figure 81]

[Figure 82]

[Figure 83]

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[Figure 87]

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[Figure 89]

[Figure 90]

[Figure 91]

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[Figure 109]

[Figure 110]

1

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

138[Figure 138]

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:—

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