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Metallurgy

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Ancient Greek Diadem, a photo from Halkidiki, Macedonia. A diadem from 4th century BC discovered in one of the Macedonian royal tombs in Vergina, owned by one of the wives of Philip of Maedon, father of Alexander the Great. In fact the situation was quite interesting. I never saw an interdiction for taking photographs entering the museum as in other museums. However, I supposed that it was banned. But I could not resits to the beauty of these wreaths, they were as something never seen before, so finely crafted, chefs d'oeuvre! And the decoration and lighting were so perfect!

Behind the diadem there were little golden Vergina stars posed on purple cloth.

Evidence of casting

385: African Steel Making. The Emergence of Iron Smelting and Blacksmithing: 900 B. C. to the Early Roman Empire. The Emergence of Iron Smelting and Blacksmithing: 900 B. C. to the Early Roman Empire The technology required to separate iron from its ores and convert it into durable and useful objects is far more complicated than that needed to work successfully with copper and bronze. For one thing, it requires a temperature of about 3650 degrees Fahrenheit (about 2020 degrees Celsius) to cause iron to melt sufficiently so that it will flow. The principles outlined in the article on smelting copper also apply to iron, but the techniques developed by the copper workers did not generate enough heat to cause iron ore to give up its oxygen.

Also, the quantities of carbon monoxide had to be much greater than required for copper.. The answer was to first make a high quality charcoal from hardwoods. One thing that many people studying history today don’t realize is that ancient metalworkers were not able to heat iron to the point that it flowed as a liquid.

A note on the books cited below -- (1) Cast iron from a bloomery furnace (2011) | Peter Crew. This experiment, blown at a fast rate with a high charcoal consumption, unexpectedly produced a block of cast iron, but it the normal position of a bloom. The experiment is described in detail, with analyses of the Mn-rich bog ores used,... more This experiment, blown at a fast rate with a high charcoal consumption, unexpectedly produced a block of cast iron, but it the normal position of a bloom. The experiment is described in detail, with analyses of the Mn-rich bog ores used, of the slags and of the cast iron, with a series of macro and microphotographs.

The discussion examines the role of manganese and whether or not it might have been reduced to the metal. Download (.pdf) Share Download (.pdf)Crew_et. Loading Preview. Primitive Smelting of Iron Ore. Metals and Power at Great Zimbabwe - Eugenia Herbert. The Journal of African History, Vol. 35, No. 1 (1994), pp. 1-36. History of the Blacksmith. Gold is for the mistress -- silver for the maid --Copper for the craftsman cunning at his trade. "Good! " said the Baron, sitting in his hall,"But Iron -- Cold Iron -- is master of them all. "Rudyard Kipling What is a BlacksmithA Blacksmith makes many kinds of tools and other objects out of metal. Iron ProductionIron was smelted from the ore in a blast furnace and the molten iron allowed to run from the furnace into a bed of sand. The role of the Blacksmith The role of the Black smith was very diverse not only was he the local toolmaker and "engineer" he was sometimes called upon to act as Dentist, Doctor, Undertaker,Veterinary surgeon and horse dealer.

Simon specializes in craftsmans tools. So what is the History of the Blacksmith? Traditional hand forged tools Forging edged tools The amount of carbon in Steel determines whether it can be hardened or not. Hardening the bladeThe hardening process consisted of heating the blade to a cherry red temperature and quenching. Ancient Africa: The Iron Age in Sub-Sahara Africa. Unlike Europe, Sub-Saharan Africa lacks a Bronze Age, a period in which softer metals, such as copper, were made into artifacts. In Sub-Saharan Africa there is a Stone Age and an Iron Age. The earliest evidence of iron-working in Africa south of the Sahara comes from the Jos Plateau in Nigeria and from the area around Lake Victoria.

In both of these areas, early metallurgy shows little evidence of local antecedents. Therefore, many archaeologists have suggested that the knowledge of ironworking and smelting diffused from the north: perhaps from the Carthaginian colonies of western Mediterranean Africa or from the Nile Valley. In Nigeria, the Nok culture appears about 1000 BCE in central Nigeria. Examples of the terracotta figures are shown below: At the Nok site of Taruga, people were engaged in iron-working by 600 BCE. Shown below is a terracotta figure from Taruga: At the Nok site of Samun Dukiya (300 BCE to 100 BCE), there is no evidence of an earlier occupation. Ancient African Metallurgy, The Sociocultural Context - Google Play. Roman metallurgy. Central Italy itself was not rich in metal ores, leading to necessary trade networks in order to meet the demand for metal from the Republic.

Early Italians had some access to metals in the northern regions of the peninsula in Tuscany and Cisalpine Gaul, as well as the islands Elba and Sardinia. With the conquest of Etruria in 275 BC and the subsequent acquisitions due to the Punic Wars, Rome had the ability to stretch further into Transalpine Gaul and Iberia, both areas rich in minerals. At the height of the Roman Empire, Rome exploited mineral resources from Tingitana in north western Africa to Egypt, Arabia to North Armenia, Galatia to Germania, and Britannia to Iberia, encompassing all of the Mediterranean coast. Britannia, Iberia, Dacia, and Noricum were of special significance, as they were very rich in deposits and became major sites of resource exploitation(Shepard 1993). .

[edit] Sources of ore[edit] Las Médulas, remains of the most important gold mine in the Roman Empire. IRON IN AFRICA: REVISING THE HISTORY : UNESCO. IRON IN AFRICA: REVISING THE HISTORY Paris - Africa developed its own iron industry some 5,000 years ago, according to a formidable new scientific work from UNESCO Publishing that challenges a lot of conventional thinking on the subject.

Iron technology did not come to Africa from western Asia via Carthage or Merowe as was long thought, concludes "Aux origines de la métallurgie du fer en Afrique, Une ancienneté méconnue: Afrique de l'Ouest et Afrique centrale". The theory that it was imported from somewhere else, which - the book points out - nicely fitted colonial prejudices, does not stand up in the face of new scientific discoveries, including the probable existence of one or more centres of iron-working in west and central Africa andthe Great Lakes area.

The authors of this joint work, which is part of the "Iron Roads in Africa" project (see box), are distinguished archaeologists, engineers, historians, anthropologists and sociologists. But the facts speak for themselves. Iron: Iron mineral information and data. Native metal. Only gold, silver, copper and the platinum metals occur in nature in larger amounts. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as native metals. The others usually occur as isolated pockets where a natural chemical process reduces a common compound or ore of the metal, leaving the pure metal behind as small flakes or inclusions.

Non-metallic elements occurring in the native state include carbon and sulfur. Silicon, a semi-metal, has been found in the native state on rare occasions as small inclusions in gold.[1] Native metals were prehistoric man's only access to metal, since the process of extracting metals from their ores, smelting, is thought to have been discovered around 6500 BC. However, they could be found only in relatively small amounts, so they could not be used extensively. Native gold partially embedded in quartz gangue Gold[edit] Bleb (mineralogy)

Specimen of goethite with blebs of green malachite. In geology, mineralogy, and petrology, a bleb is a small bubble-like inclusion of one mineral within a larger mineral. An example is a bleb of sylvite within chlorite. Blebs tend to be brightly coloured. Kamenetsky VS et al. Chloride and carbonate immiscible liquids at the closure of the kimberlite magma evolution (Udachnaya-East kimberlite, Siberia) Chemical Geology, Volume 237, Issues 3-4, 5 March 2007, Pages 384-400. Seeking Africa's First Iron Men. The Civilizations of Africa: A History to 1800 - Christopher Ehret.