χαλκός
Chalcus, a Latin word derived from the Greek word χαλκός meaning copper or bronze (plural ''chalci''), may refer to : * Dionysius Chalcus, an ancient Athenian poet and orator * a Greek copper money (see Ancient Roman units of measurement) * Captain Chalcus, a character in the 1999 fantasy novel ''Servant of the Dragon'' See also * Chalcis Chalcis (; Ancient Greek and Katharevousa: , ), also called Chalkida or Halkida (Modern Greek: , ), is the chief city of the island of Euboea or Evia in Greece, situated on the Euripus Strait at its narrowest point. The name is preserved from ...

Copper
Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in a directly usable, unalloyed metallic form. This means that copper is a native metal. This led to very early human use in several regions, from . Thousands of years later, it was the first metal to be smelted from sulfide ores, ; the first metal to be cast into a shape in a mold, ; and the first metal to be purposely alloyed with another metal, tin, to create bronze, ...
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Bronze
Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals (such as phosphorus) or metalloids (such as arsenic or silicon). These additions produce a range of alloys some of which are harder than copper alone or have other useful properties, such as strength, ductility, or machinability. The archaeological period during which bronze was the hardest metal in widespread use is known as the Bronze Age. The beginning of the Bronze Age in western Eurasia is conventionally dated to the mid-4th millennium BCE (~3500 BCE), and to the early 2nd millennium BCE in China; elsewhere it gradually spread across regions. The Bronze Age was followed by the Iron Age, which started about 1300 BCE and reaching most of Eurasia by about 500 BCE, although bronze continued to be much more widely used than it is in modern times. Because historica ...
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Dionysius Chalcus
Dionysius Chalcus () was an ancient Athenian poet and orator. According to Athenaeus, he was called Chalcus ("brazen") because he advised the Athenians to adopt a brass coinage (xv. p. 669). His speeches have not survived, but his poems are referred to and quoted by such authors as Plutarch ('' Nicias'', 5), Aristotle (''Rhetoric,'' iii. 2), and Athenaeus (xv, p. 668, 702; x, p. 443; xiii, p. 602). The extant fragments are chiefly elegies on symposiac subjects and are characterized by extravagant metaphors. Plutarch credits Dionysius Chalcus with leading the band of Athenian colonists who founded Thurii Thurii (; ; ), called also by some Latin writers Thūrium (compare , in Ptolemy), and later in Roman times also Cōpia and Cōpiae, was an ancient Greek city situated on the Gulf of Taranto, near or on the site of the great renowned city of Syb ... in 443 BC. References Sources *Osann, ''Beiträge z. Griech. u. Röm. Lit.'' i. p. 79, &c.; Welcker, ...
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Ancient Roman Units Of Measurement
The units of measurement of ancient Rome were generally consistent and well documented. Length The basic unit of Roman linear measurement was the ''pes'' (plural: ''pedes'') or Roman foot. Investigation of its relation to the English foot goes back at least to 1647, when John Greaves published his ''Discourse on the Romane foot''. Greaves visited Rome in 1639, and measured, among other things, the foot measure on the tomb of Titus Statilius Aper, that on the statue of Cossutius formerly in the gardens of Angelo Colocci, the congius of Vespasian previously measured by Villalpandus, a number of brass measuring-rods found in the ruins of Rome, the paving-stones of the Pantheon and many other ancient Roman buildings, and the distance between the milestones on the Appian Way. He concluded that the Cossutian foot was the "true" Roman foot, and reported these values compared to the iron standard of the English foot in the Guildhall in London William Smith (1851) gives a value ...
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