11 sentences with 'copper'
Example sentences and phrases with the word copper and other words derived from it.
• « Bronze, an alloy of copper and zinc or nickel, required technical skill and access to its constituent minerals to make. However, the final product was much harder and more durable than copper alone, and with the advent of large-scale use of bronze in Egypt by the Hyksos, the possibilities for the growth of Egyptian power increased enormously. »
• « Egyptian soldiers were often no more than peasants armed with copper knives, spears with copper heads, or even just sticks. »
• « Needless to say, historical people had no idea why, when they took tin and copper, heated them and pounded them together on an anvil, they created something much harder and more durable than either of their starting metals. Some innovative blacksmith discovered this, and in the process gave rise to a number of new possibilities. »
• « With neither copper nor tin available, some innovative blacksmiths discovered that it was possible, through a complicated forging process, to create iron utensils that were hard and durable. »
• « The head of the ancient axe found is made of almost pure copper, and skilfully mounted on an L-shaped yew handle. »
• « In ancient times copper could be worked into weapons, tools, ingots and jewellery; people used to carry it with them, used it as an exchange value and passed it on to their descendants. »
• « In 1938, on Rabua Hill in Iran, this researcher found vase-shaped vessels with a copper cylinder inside. They were 15 centimetres high and the copper tube was 26 millimetres in diameter and 19 centimetres high. Inside the copper tube protruded a 1-centimetre iron wand. These objects were reminiscent - with surprising accuracy - of modern-day electric batteries. The Ministry of Information in Baghdad officially reported that these batteries were dated to between 227 and 126 BC. »
• « Quantitative spectroscopic analysis in Russia showed that some copper knives, awls and arrowheads found in archaeological excavations contained arsenic and tin. The objects come from the Caucasus region and date back to the 4th century BC. »
• « Arsenical copper declined in favour of alloying copper with tin, possibly because of the poisonous effects of arsenic. It is likely that during smelting, the fumes caused cases of poisoning, so more innocuous compounds were sought. If so, this would be the first case of a "toxic cloud" in ancient times, and the resulting reactions. »
• « The use of metal objects, specifically copper, reflects a great cultural development in these ancient civilisations. »