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63-568: The Frome Hoard is a hoard of 52,503 Roman coins found in April 2010, by metal detectorist Dave Crisp near Frome in Somerset , England. The coins were contained in a ceramic pot 45 cm (18 in) in diameter, and date from AD 253 to 305. Most of the coins are made from debased silver or bronze. The hoard is one of the largest ever found in Britain, and is also important as it contains

126-609: A BBC Two television programme, Digging for Britain , presented by Alice Roberts in August 2010. The hoard was put on permanent display at the Museum of Somerset when it reopened on 29 September 2011. Hoard Hoards provide a useful method of providing dates for artifacts through association as they can usually be assumed to be contemporary (or at least assembled during a decade or two), and therefore used in creating chronologies. Hoards can also be considered an indicator of

189-601: A Vinča culture site in Pločnik ( Serbia ), and believed to have been smelted from a natural tin-copper ore, stannite . Other early examples date to the late 4th millennium BC in Egypt , Susa (Iran) and some ancient sites in China, Luristan (Iran), Tepe Sialk (Iran), Mundigak (Afghanistan), and Mesopotamia (Iraq). Tin bronze was superior to arsenic bronze in that the alloying process could be more easily controlled, and

252-524: A copper oxide (eventually becoming copper carbonate) layer is formed, the underlying metal is protected from further corrosion . This can be seen on statues from the Hellenistic period. If copper chlorides are formed, a corrosion-mode called " bronze disease " will eventually completely destroy it. Bronze, or bronze-like alloys and mixtures, were used for coins over a longer period. Bronze was especially suitable for use in boat and ship fittings prior to

315-665: A major influence on the development of cultures. In Europe, a major source of tin was the British deposits of ore in Cornwall , which were traded as far as Phoenicia in the eastern Mediterranean . In many parts of the world, large hoards of bronze artifacts are found, suggesting that bronze also represented a store of value and an indicator of social status. In Europe, large hoards of bronze tools, typically socketed axes (illustrated above), are found, which mostly show no signs of wear. With Chinese ritual bronzes , which are documented in

378-611: A range of alloys that may be harder than copper alone, or have other useful properties, such as strength , ductility , or machinability . The archaeological period in which bronze was the hardest metal in widespread use is known as the Bronze Age . The beginning of the Bronze Age in western Eurasia and India is conventionally dated to the mid-4th millennium BC (~3500 BC), and to the early 2nd millennium BC in China; elsewhere it gradually spread across regions. The Bronze Age

441-551: A sharper edge longer. Bronze was still used during the Iron Age, and has continued in use for many purposes to the modern day. There are many different bronze alloys, but typically modern bronze is 88% copper and 12% tin. Alpha bronze consists of the alpha solid solution of tin in copper. Alpha bronze alloys of 4–5% tin are used to make coins, springs, turbines and blades. Historical "bronzes" are highly variable in composition, as most metalworkers probably used whatever scrap

504-664: A small radiate coin, and the top of a small pot. Realising that this must be an intact coin hoard he stopped digging and filled in the hole he had made. In 22 years of detecting Crisp had never made such a significant find. On 15 April, Crisp notified Katie Hinds, the Portable Antiquities Scheme Finds Liaison Officer for Wiltshire , that he had found the hoard of coins. On 22 April Hinds, together with Anna Booth (Finds Liaison Officer for Somerset) and Alan Graham—an independent archaeologist contracted by Somerset County Council —visited

567-428: A temple or church become the property of that institution, and may be used to its benefit. 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

630-416: Is a better conductor of heat and electricity than most steels. The cost of copper-base alloys is generally higher than that of steels but lower than that of nickel -base alloys. Bronzes are typically ductile alloys, considerably less brittle than cast iron. Copper and its alloys have a huge variety of uses that reflect their versatile physical, mechanical, and chemical properties . Some common examples are

693-648: Is a collection of personal objects buried for safety in times of unrest. A hoard of loot is a buried collection of spoils from raiding and is more in keeping with the popular idea of " buried treasure ". Votive hoards are different from the above in that they are often taken to represent permanent abandonment, in the form of purposeful deposition of items, either all at once or over time for ritual purposes, without intent to recover them . Furthermore, votive hoards need not be "manufactured" goods, but can include organic amulets and animal remains. Votive hoards are often distinguished from more functional deposits by

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756-527: Is likely that 'nehoshet' refers to copper and its alloys with tin, now called bronze. In the King James Version, there is no use of the word 'bronze' and 'nehoshet' was translated as 'brass'. Modern translations use 'bronze'. Bronze (nehoshet) was used widely in the Tabernacle for items such as the bronze altar (Exodus Ch.27), bronze laver (Exodus Ch.30), utensils, and mirror (Exodus Ch.38). It

819-453: Is used to make hammers , mallets , wrenches and other durable tools to be used in explosive atmospheres or in the presence of flammable vapors. Bronze is used to make bronze wool for woodworking applications where steel wool would discolor oak . Phosphor bronze is used for ships' propellers, musical instruments, and electrical contacts. Bearings are often made of bronze for its friction properties. It can be impregnated with oil to make

882-541: Is used to make the tone rings of many professional model banjos . The tone ring is a heavy (usually 3 lb; 1.4 kg) folded or arched metal ring attached to a thick wood rim, over which a skin, or most often, a plastic membrane (or head) is stretched – it is the bell bronze that gives the banjo a crisp powerful lower register and clear bell-like treble register. Bronze has also been used in coins; most "copper" coins are actually bronze, with about 4 percent tin and 1 percent zinc. As with coins, bronze has been used in

945-578: The Britannic Empire of Carausius , as shown in the table below. About 5% of the coins identified so far are from the period of Carausius , who ruled Britain from 286 to 293, and the hoard includes five silver denarii issued by Carausius, which were the only type of silver coin to be struck anywhere in the Roman Empire at that time. Most Roman coin hoards are traditionally believed to have been buried by their owners for safe-keeping, with

1008-560: The Etruscans were making bronze mirrors in the sixth century BC, and Greek and Roman mirrors followed the same pattern. Although other materials such as speculum metal had come into use, and Western glass mirrors had largely taken over, bronze mirrors were still being made in Japan and elsewhere in the eighteenth century, and are still made on a small scale in Kerala , India. Bronze is

1071-513: The Golden Age , when men lived among the gods; the Silver age , where youth lasted a hundred years; and the Bronze Age , the era of heroes. It was first adopted for a sports event at the 1904 Summer Olympics . At the 1896 event, silver was awarded to winners and bronze to runners-up, while at 1900 other prizes were given rather than medals. Bronze is the normal material for the related form of

1134-756: The Kingdom of Benin ; in Europe, Grecian bronzes typically of figures from Greek mythology ; in east Asia , Chinese ritual bronzes of the Shang and Zhou dynasty —more often ceremonial vessels but including some figurine examples. Bronze continues into modern times as one of the materials of choice for monumental statuary. Tiffany Glass Studios, made famous by Louis C. Tiffany commonly referred to his product as favrile glass or " Tiffany glass ," and used bronze in their artisan work for his Tiffany lamps . The largest and most ornate bronze fountain known to be cast in

1197-599: The Museum of Somerset in Taunton acquired the hoard in 2011. A selection of the coins were initially on display at the British Museum on 8 July 2010 for a press photocall, and the entire hoard was subsequently displayed at the British Museum between 15 July and 31 August 2010. Some of the coins were exhibited at Frome Library on 22 July 2010, and again on 23 October 2010. The find was included as part of

1260-550: The plaquette , normally a rectangular work of art with a scene in relief , for a collectors' market. Bronze is also associated with eighth wedding anniversaries. There are over 125 references to bronze ('nehoshet'), which appears to be the Hebrew word used for copper and any of its alloys. However, the Old Testament era Hebrews are not thought to have had the capability to manufacture zinc (needed to make brass) and so it

1323-623: The 12th-century Romanesque Baptismal font at St Bartholomew's Church, Liège is sometimes described as bronze and sometimes as brass . In the Bronze Age, two forms of bronze were commonly used: "classic bronze", about 10% tin, was used in casting; and "mild bronze", about 6% tin, was hammered from ingots to make sheets. Bladed weapons were mostly cast from classic bronze, while helmets and armor were hammered from mild bronze. Modern commercial bronze (90% copper and 10% zinc) and architectural bronze (57% copper, 3% lead , 40% zinc) are more properly regarded as brass alloys because they contain zinc as

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1386-590: The British Museum, and Roger Bland, Head of the Department of Portable Antiquities and Treasure at the British Museum , drove to Frome to collect the excavated coins, and drove them back to the British Museum in London. Over the next six weeks Metals Conservator Pippa Pearce washed and dried all the coins in order to stabilise them, but did not perform a full conservation, which would have cost an additional £35,000. The coins comprise 67 separate types, and date from

1449-467: The Crown . However, under the terms of the 1996 Treasure Act , a museum may purchase the hoard at an officially-determined price, with half of the proceeds going to the finder and half to the landowner. Somerset County Council Heritage Service indicated that it wished to acquire the hoard, and to put the coins on display in the new Museum of Somerset in Taunton when it re-opened in 2011. In October 2010,

1512-498: The antiquities market, it often happens that miscellaneous objects varying in date and style have become attached to the original group. Such "dealer's hoards" can be highly misleading, but better understanding of archaeology amongst collectors, museums and the general public is gradually making them less common and more easily identified. Hoards may be of precious metals , coinage , tools or less commonly, pottery or glass vessels. There are various classifications depending on

1575-452: The barrel. It is still widely used today for springs, bearings, bushings, automobile transmission pilot bearings, and similar fittings, and is particularly common in the bearings of small electric motors . Phosphor bronze is particularly suited to precision-grade bearings and springs. It is also used in guitar and piano strings. Unlike steel, bronze struck against a hard surface will not generate sparks, so it (along with beryllium copper )

1638-423: The difficulty in lifting the broken pot with the contents still inside—which would be the preferred archaeological method, so that the contents could be excavated in controlled, laboratory conditions—the decision was taken to excavate the coins in the field. The coins were removed in layers, by which method it was hoped to determine if there was any chronological pattern in the deposition of the coins; that is, whether

1701-408: The earliest coins were at the bottom and latest coins at the top. The coins were collected in 66 labelled bags, and in total weighed approximately 160 kg (350 lb). Graham excavated and recorded the finds, and the others bagged the coins as Graham lifted them out. Given the weight of the coins and the relatively thin walls of the pot, it is thought that it would not have been possible to carry

1764-406: The filled pot to the site: the pot would probably have been buried in the ground first, then the coins were poured in before it was sealed and covered over. After the hoard had been lifted, an archaeological geophysics team was contracted to investigate the area around the hoard but failed to find any evidence of settlement. On 26 April, Sam Moorhead, Finds Advisor for Iron Age and Roman coins at

1827-545: The high electrical conductivity of pure copper, low-friction properties of bearing bronze (bronze that has a high lead content— 6–8%), resonant qualities of bell bronze (20% tin, 80% copper), and resistance to corrosion by seawater of several bronze alloys. The melting point of bronze varies depending on the ratio of the alloy components and is about 950 °C (1,742 °F). Bronze is usually nonmagnetic, but certain alloys containing iron or nickel may have magnetic properties. Typically bronze oxidizes only superficially; once

1890-699: The highest form of sculpture in Ancient Greek art , though survivals are few, as bronze was a valuable material in short supply in the Late Antique and medieval periods. Many of the most famous Greek bronze sculptures are known through Roman copies in marble, which were more likely to survive. In India, bronze sculptures from the Kushana ( Chausa hoard ) and Gupta periods ( Brahma from Mirpur-Khas , Akota Hoard, Sultanganj Buddha ) and later periods ( Hansi Hoard) have been found. Indian Hindu artisans from

1953-629: The hoard was valued by the Treasure Valuation Committee at £320,250, and a public appeal was launched by the Art Fund . The Art Fund itself provided an initial £40,250, while the British Museum donated 50p for each copy sold of its book on the hoard (see Further Reading, below). Ultimately, with the help of a grant from the National Heritage Memorial Fund , including £105,000 for conservation work,

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2016-484: The inscriptions they carry and from other sources, the case is clear. These were made in enormous quantities for elite burials, and also used by the living for ritual offerings. Though bronze is generally harder than wrought iron , with Vickers hardness of 60–258 vs. 30–80, the Bronze Age gave way to the Iron Age after a serious disruption of the tin trade: the population migrations of around 1200–1100 BC reduced

2079-509: The intention of being eventually recovered, but Sam Moorhead of the Portable Antiquities Scheme suggests that in this case the pot was so large and fragile that it could not have been easily recovered without breaking it, and so the hoard may represent communal votive offerings to the gods. A coroner's treasure inquest was held on 22 July 2010. The inquest declared that the coins were treasure , and hence property of

2142-456: The largest group ever found of coins issued during the reign of Carausius (who ruled Britain independently from 286 to 293, and was the first Roman Emperor to strike coins in Britain). The Museum of Somerset in Taunton , using a grant from the National Heritage Memorial Fund (NHMF), acquired the hoard in 2011 for a value of £320,250. The hoard was discovered on 11 April 2010 while Crisp

2205-824: The main alloying ingredient. They are commonly used in architectural applications. Plastic bronze contains a significant quantity of lead, which makes for improved plasticity, and was possibly used by the ancient Greeks in ship construction. Silicon bronze has a composition of Si: 2.80–3.80%, Mn: 0.50–1.30%, Fe: 0.80% max., Zn: 1.50% max., Pb: 0.05% max., Cu: balance. Other bronze alloys include aluminium bronze , phosphor bronze , manganese bronze, bell metal , arsenical bronze , speculum metal , bismuth bronze , and cymbal alloys . Copper-based alloys have lower melting points than steel or iron and are more readily produced from their constituent metals. They are generally about 10 percent denser than steel, although alloys using aluminum or silicon may be slightly less dense. Bronze

2268-462: The manufacture of various types of medals for centuries, and " bronze medals " are known in contemporary times for being awarded for third place in sporting competitions and other events. The term is now often used for third place even when no actual bronze medal is awarded. The usage in part arose from the trio of gold , silver and bronze to represent the first three Ages of Man in Greek mythology:

2331-673: The massive bronze doors to the United States Supreme Court Building in Washington, DC. Before it became possible to produce glass with acceptably flat surfaces, bronze was a standard material for mirrors. Bronze was used for this purpose in many parts of the world, probably based on independent discoveries. Bronze mirrors survive from the Egyptian Middle Kingdom (2040–1750 BC), and China from at least c.  550 BC . In Europe,

2394-406: The mouth of the larger pot, to form a lid. First he excavated the pit fill around the exterior of the pot, identifying organic matter which might represent packing material to protect it, and determined that the pot had been broken in situ long before its discovery in 2010. He then excavated the pot itself. Due to the weight of the contents, the need for speedy excavation due to security concerns and

2457-801: The names of individual alloys. This is done (at least in part) to prevent database searches from failing merely because of errors or disagreements in the naming of historic copper alloys. The word bronze (1730–1740) is borrowed from Middle French bronze (1511), itself borrowed from Italian bronzo ' bell metal, brass ' (13th century, transcribed in Medieval Latin as bronzium ) from either: The discovery of bronze enabled people to create metal objects that were harder and more durable than previously possible. Bronze tools , weapons , armor , and building materials such as decorative tiles were harder and more durable than their stone and copper (" Chalcolithic ") predecessors. Initially, bronze

2520-422: The nature of the goods themselves (from animal bones to diminutive artifacts), the places buried (being often associated with watery places, burial mounds and boundaries), and the treatment of the deposit (careful or haphazard placement and whether ritually destroyed/broken). Valuables dedicated to the use of a deity (and thus classifiable as "votive") were not always permanently abandoned. Valuable objects given to

2583-439: The nature of the hoard: A founder's hoard contains broken or unfit metal objects, ingots , casting waste, and often complete objects, in a finished state. These were probably buried with the intention to be recovered at a later time. A merchant's hoard is a collection of various functional items which, it is conjectured, were buried by a traveling merchant for safety, with the intention of later retrieval. A personal hoard

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2646-446: The period 253 to 305. The vast majority of coins are made from bronze , but five are made from solid silver . Of the 52,503 coins found, 44,245 have been identified, and the remainder are classified provisionally as "illegible" until cleaning and conservation has been completed. Of the identifiable coins, 14,788 were minted under the central Roman Empire , 28,377 were minted under the breakaway Gallic Empire , and 766 were minted under

2709-581: The period of the Chola empire in Tamil Nadu used bronze to create intricate statues via the lost-wax casting method with ornate detailing depicting the deities of Hinduism . The art form survives to this day, with many silpis, craftsmen, working in the areas of Swamimalai and Chennai . In antiquity other cultures also produced works of high art using bronze. For example: in Africa, the bronze heads of

2772-424: The preferred metal for bells in the form of a high tin bronze alloy known as bell metal , which is typically about 23% tin. Nearly all professional cymbals are made from bronze, which gives a desirable balance of durability and timbre . Several types of bronze are used, commonly B20 bronze , which is roughly 20% tin, 80% copper, with traces of silver, or the tougher B8 bronze made from 8% tin and 92% copper. As

2835-452: The proprietary Oilite and similar material for bearings. Aluminum bronze is hard and wear-resistant, and is used for bearings and machine tool ways. The Doehler Die Casting Co. of Toledo, Ohio were known for the production of Brastil , a high tensile corrosion resistant bronze alloy. The Seagram Building on New York City 's Park Avenue is the "iconic glass box sheathed in bronze, designed by Mies van der Rohe ." The Seagram Building

2898-454: The ready availability of silicon bronze brazing rod, which allows color-matched repair of defects in castings. Aluminum is also used for the structural metal aluminum bronze. Bronze parts are tough and typically used for bearings , clips, electrical connectors and springs . Bronze also has low friction against dissimilar metals, making it important for cannons prior to modern tolerancing , where iron cannonballs would otherwise stick in

2961-863: The relative degree of unrest in ancient societies. Thus conditions in 5th and 6th century Britain spurred the burial of hoards, of which the most famous are the Hoxne Hoard , Suffolk; the Mildenhall Treasure , the Fishpool Hoard , Nottinghamshire, the Water Newton hoard, Cambridgeshire, and the Cuerdale Hoard , Lancashire, all preserved in the British Museum . Prudence Harper of the Metropolitan Museum of Art voiced some practical reservations about hoards at

3024-690: The resulting alloy was stronger and easier to cast. Also, unlike those of arsenic , metallic tin and the fumes from tin refining are not toxic . Tin became the major non-copper ingredient of bronze in the late 3rd millennium BC. Ores of copper and the far rarer tin are not often found together (exceptions include Cornwall in the United Kingdom, one ancient site in Thailand and one in Iran), so serious bronze work has always involved trade with other regions. Tin sources and trade in ancient times had

3087-478: The shipping of tin around the Mediterranean and from Britain, limiting supplies and raising prices. As the art of working in iron improved, iron became cheaper and improved in quality. As later cultures advanced from hand- wrought iron to machine- forged iron (typically made with trip hammers powered by water), blacksmiths also learned how to make steel . Steel is stronger and harder than bronze and holds

3150-427: The site to carry out an emergency excavation. The excavation, led by Graham and assisted by Hinds, Booth, Crisp and members of the landowner's family, was performed over three days, from 23 to 25 April. Graham initially excavated a 1.5 metres (4.9 ft) trench around the small hole that Crisp had dug, and identified the pit in which the pot had been deposited. A small black-burnished ware bowl had been inverted over

3213-723: The time of the Soviet exhibition of Scythian gold in New York City in 1975. Writing of the so-called "Maikop treasure" (acquired from three separate sources by three museums early in the twentieth century, the Berliner Museen , the University of Pennsylvania Museum of Archaeology and Anthropology , and the Metropolitan Museum, New York), Harper warned: By the time "hoards" or "treasures" reach museums from

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3276-469: The tin content in a bell or cymbal rises, the timbre drops. Bronze is also used for the windings of steel and nylon strings of various stringed instruments such as the double bass , piano, harpsichord , and guitar. Bronze strings are commonly reserved on pianoforte for the lower pitch tones, as they possess a superior sustain quality to that of high-tensile steel. Bronzes of various metallurgical properties are widely used in struck idiophones around

3339-439: The unusual and desirable property of expanding slightly just before they set, thus filling the finest details of a mould. Then, as the bronze cools, it shrinks a little, making it easier to separate from the mould. The Assyrian king Sennacherib (704–681 BC) claims to have been the first to cast monumental bronze statues (of up to 30 tonnes) using two-part moulds instead of the lost-wax method . Bronze statues were regarded as

3402-419: The wide employment of stainless steel owing to its combination of toughness and resistance to salt water corrosion. Bronze is still commonly used in ship propellers and submerged bearings. In the 20th century, silicon was introduced as the primary alloying element, creating an alloy with wide application in industry and the major form used in contemporary statuary . Sculptors may prefer silicon bronze because of

3465-657: The world was by the Roman Bronze Works and General Bronze Corporation in 1952. The material used for the fountain, known as statuary bronze, is a quaternary alloy made of copper, zinc, tin, and lead, and traditionally golden brown in color. This was made for the Andrew W. Mellon Memorial Fountain in Federal Triangle in Washington, DC. Another example of the massive, ornate design projects of bronze, and attributed to General Bronze/Roman Bronze Works were

3528-710: The world, notably bells, singing bowls, gongs , cymbals, and other idiophones from Asia. Examples include Tibetan singing bowls , temple bells of many sizes and shapes, Javanese gamelan , and other bronze musical instruments . The earliest bronze archeological finds in Indonesia date from 1–2 BC, including flat plates probably suspended and struck by a wooden or bone mallet. Ancient bronze drums from Thailand and Vietnam date back 2,000 years. Bronze bells from Thailand and Cambodia date back to 3600 BC. Some companies are now making saxophones from phosphor bronze (3.5 to 10% tin and up to 1% phosphorus content). Bell bronze/B20

3591-429: Was followed by the Iron Age starting about 1300 BC and reaching most of Eurasia by about 500 BC, although bronze continued to be much more widely used than it is in modern times. Because historical artworks were often made of brasses (copper and zinc) and bronzes of different metallic compositions, modern museum and scholarly descriptions of older artworks increasingly use the generalized term "copper alloy" instead of

3654-525: Was made out of copper and arsenic or from naturally or artificially mixed ores of those metals, forming arsenic bronze . The earliest known arsenic-copper-alloy artifacts come from a Yahya Culture (Period V 3800-3400 BCE) site, at Tal-i-Iblis on the Iranian plateau , and were smelted from native arsenical copper and copper-arsenides, such as algodonite and domeykite . The earliest tin-copper-alloy artifact has been dated to c.  4650 BC , in

3717-474: Was mentioned in the account of Moses holding up a bronze snake on a pole in Numbers Ch.21. In First Kings, it is mentioned that Hiram was very skilled in working with bronze, and he made many furnishings for Solomon's Temple including pillars, capitals, stands, wheels, bowls, and plates, some of which were highly decorative (see I Kings 7:13-47). Bronze was also widely used as battle armor and helmet, as in

3780-406: Was metal detecting in a field near Frome where he had previously found late Roman silver coins. The late Roman coins, eventually totalling 62, were probably the remnants of a scattered hoard, 111 of which had been found on the same farm in 1867. Whilst searching for more coins from the scattered hoard he received what he called a "funny signal" and on digging down about 35 cm (14 in) he found

3843-424: Was not only the most expensive building of its time — $ 36 million — but it was the first building in the world with floor-to-ceiling glass walls. Mies van der Rohe achieved the crisp edges that were custom-made with specific detailing by General Bronze and "even the screws that hold in the fixed glass-plate windows were made of brass." Bronze is widely used for casting bronze sculptures . Common bronze alloys have

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3906-481: Was on hand; the metal of the 12th-century English Gloucester Candlestick is bronze containing a mixture of copper, zinc, tin, lead, nickel, iron, antimony, arsenic and an unusually large amount of silver – between 22.5% in the base and 5.76% in the pan below the candle. The proportions of this mixture suggest that the candlestick was made from a hoard of old coins. The 13th-century Benin Bronzes are in fact brass, and

3969-593: Was the first time that an entire building was sheathed in bronze. The General Bronze Corporation fabricated 3,200,000 pounds (1,600 tons) of bronze at its plant in Garden City, New York . The Seagram Building is a 38-story, 516-foot bronze-and- topaz -tinted glass building. The building looks like a "squarish 38-story tower clad in a restrained curtain wall of metal and glass." "Bronze was selected because of its color, both before and after aging, its corrosion resistance, and its extrusion properties. In 1958, it

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