Agricola, Georgius, De re metallica, 1912/1950

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1which the ordinary people call nummi41; each of these units we again divide
into twenty-four units of four siliquae each, which the same ordinary people
call a grenlin; or else the bes is divided into sixteen semunciae which
are called loths, each of which is again divided into eighteen units of four
silíquae each, which they call grenlín. Or else the bes is divided into
sixteen semuncíae, of which each is divided into four drachmae, and
each drachma into four pfennige. Needles are made in accordance with
each method of dividing the bes. According to the first method, to the
number of twenty-four half nummí; according to the second method, to the
number of thirty-one half semuncíae, that is to say a sícílícus; for if the
needles were made to the number of the smaller weights, the number of
needles would again be too large, and not a few of them, by reason of the
small difference in proportion of silver or copper, would have no significance.
We test both bars and coined money composed of silver and copper by both
scales.
The one is as follows: the first needle is made of twenty-three
parts of copper and one part silver; whereby, whatsoever bar or coin, when
rubbed on the touchstone, colours it just as this needle does, in that bar or
money there is one twenty-fourth part of silver, and so also, in accordance
with the proportion of silver, is known the remaining proportion of the copper.
The 1st needle is made of 23 parts of copper and 1 of silver.
The 2nd needle is made of 22 parts of copper and 2 of silver.
The 3rd needle is made of 21 parts of copper and 3 of silver.
The 4th needle is made of 20 parts of copper and 4 of silver.
The 5th needle is made of 19 parts of copper and 5 of silver.
The 6th needle is made of 18 parts of copper and 6 of silver.
The 7th needle is made of 17 parts of copper and 7 of silver.
The 8th needle is made of 16 parts of copper and 8 of silver.
The 9th needle is made of 15 parts of copper and 9 of silver.
The 10th needle is made of 14 parts of copper and 10 of silver.
The 11th needle is made of 13 parts of copper and 11 of silver.
The 12th needle is made of 12 parts of copper and 12 of silver.
The 13th needle is made of 11 parts of copper and 13 of silver.
The 14th needle is made of 10 parts of copper and 14 of silver.
The 15th needle is made of 9 parts of copper and 15 of silver.
The 16th needle is made of 8 parts of copper and 16 of silver.
The 17th needle is made of 7 parts of copper and 17 of silver.
The 18th needle is made of 6 parts of copper and 18 of silver.
The 19th needle is made of 5 parts of copper and 19 of silver.
The 20th needle is made of 4 parts of copper and 20 of silver.
The 21st needle is made of 3 parts of copper and 21 of silver.
The 22nd needle is made of 2 parts of copper and 22 of silver.
The 23rd needle is made of 1 parts of copper and 23 of silver.
The 24th of pure silver.

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