Early Metal Technology
|There is more to metal technology than just straight smelting, melting, casting, hammering, filing and polishing. Maybe not a lot more, but enough to warrant a few modules:
Topics covered are: deposits, parting by cementation, purifying by cupellation, alloying, color, working and specialities.
Silver (Ag) and Lead (Pb)
Topics covered are: Making fun of Aristotle, silver production via cupellation of lead, lead production and uses.
Tin (Sn) and Zinc (Zn)
Topics covered are: tin mining and ore treatment, production. Why Zn is special.
Topics covered are: When, how and why?
|The Seven Metals of Antiquity
|Until the 14th century AD, (Western) humankind only distinguished seven metals,
known as the "seven metals of antiquity
": Gold, Silver, Copper, Iron, Tin, Lead and Mercury. Zinc, covered above, was unknowingly used as alloy element
in copper (producing brass) but never obtained in its elemental state. Copper and iron will not be dealt with here since
they are covered extensively in the backbone of the Hyperscript.
The distinction of seven metals does not mean that these metals were seen as what we now call elements. Up to about 1700, only the four "old" elements (earth, water, fire and air) plus Aristotle's 5th element ("aether") "existed"; metals were a mixture of earth and water. Mercury, for example, was seen as some modification of silver. Its Greek name was Hydrargyrum", meaning "watery silver".
|In fact, one and the same word might have been used for different metals in some ancient culture. In ancient Greek Copper and probably all its alloys was called "chalcos" after the copper mines at Chalcis in Euboea. This word is still the root for many present-day words like "Chalcolithic age" (fancy for copper age), "Chalcopyrite" = copper pyrites or sulfides. But the same word was also used for iron, long before it eventually changed to "sideros ". The word for steel was caluy, clearly related to chalcos. Later it changed to "Chalybs", however.
|Our present-day words like bronze or brass for describing certain copper alloys have their roots in the middle age. No Roman, Greek, Assyrians and so on used words remotely similar.
|We do not know what kind of "theories" people entertained for metals and their ores in the very early times because they neglected to write it down or to draw some cartoons. What we do know comes exclusively from later writings that survived. Metal technology, however, is far older than writing. Even after writing was established, the people who expressed themselves in writing would mostly not write extensively about lowly topics like how to make things. They liked to write about sex and violence; consider, e.g., the "Leda and the swan" story. Or worse, about philosophy if not religion.
|However, one of the earliest pieces of writing, the Gilgamesh epos from roughly 2000 BC, when "stripped of sex and violence", to quote Jason Godesky, is about deforestation caused be the metal industry in Sumeria. "Gilgamesh and his companion go off to cut down a cedar forest, braving the wrath of the forest god Humbaba, who has been entrusted with forest conservation. It's interesting that Gilgamesh is cast as the hero, even though he has the typical logger mentality: cut it down, and never mind the consequences. The repercussions for Gilgamesh are severe: he loses his chance of immortality, for example. But the consequences for Sumeria were even worse. .... The loss of Gilgamesh's immortality may be a literary reflection of the realization that Sumeria could not be sustained" 1).
|Unfortunately, what made big waves back then, and for a long time after, is the BS that Aristotle
exuded; a taste treat can be found here. In his warped imagination,
the rays of the sun penetrated the earth and somehow made the metal (ores) and the hot stuff inside that is sometimes coughed
up by volcanoes. That view survived until about 1500 and then even spread (printing was invented) and got enlarged by the
Prospecting was done with a divining rod if you believe written accounts. I bet that those early (probably illiterate) prospectors also kept their eyes open for the typical signs of a "gossan" and so on.
In the words of Ron Morton, teaching "Economic Geology 4350" at the University of Minnesota Duluth: "The alchemists essentially took Aristotles and Platos ideas and modified them. One addition was the idea that not only the suns and stars rays led to mineral concentrations, but so did the rays of other planets and the moon. Thus different celestial bodies were responsible for different metals.
A smaller school of alchemists believed it was only the sun that was responsible for ore deposits. Like Aristotle they believed the suns rays penetrated deep into the earth collecting moisture and vapors which condensed and hardened into unripe metals. These then filled veins and cavities in the earths crust. Over time the unripe metals were changed or matured into the different mineable metals due to what they called the alchemy of nature. This idea led to the belief that metals could be changed or transmuted and thus the long, futile effort began to change lead, tin, etc. into gold."
|It is quite amazing what practitioners could achieve despite of the support by the "thinkers". Maybe sometimes it is an advantage if you can't read.
|Jason Godesky: "Peak Wood", published by The Anthropik Network on 2005-10-25 Original article: http://anthropik.com/2005/10/peak-wood/
Books and Other Major Sources
Early Metal Technology - 2. Silver and Lead
Leda and the Swan
10.1.1 Discovering Metals and Smelting
Antique Texts Concerning Iron
Swords and Symbols
Smelting Science - 1. Furnaces
Antique Texts Concerning Crucible Steel
Medieval and Modern Texts Concerning Crucible Steel
Smelting Science - 2. Charcoal Technology
10.1.5 Copper Final
Early Metal Technology - 1. Gold
The Cyprus Copper and Bronze Industry
© H. Föll (Iron, Steel and Swords script)