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124-546: Bloede was born in 1849, in Dresden , Kingdom of Saxony , the son of Marie Franziska Jungnitz and Gustav Bloede. Gustav was a physician and member of the city council of Dresden during the German revolutions . Gustav had to flee Germany and made his way to Antwerp where he waited for his family to arrive. The family (Marie, Gustav, and their three children, Gertrude , Kate and Victor) sailed from Antwerp on July 14, 1850, aboard

248-524: A bar, expelling slag in the process. During the Middle Ages , water-power was applied to the process, probably initially for powering bellows, and only later to hammers for forging the blooms. However, while it is certain that water-power was used, the details remain uncertain. That was the culmination of the direct process of ironmaking. It survived in Spain and southern France as Catalan Forges to

372-582: A carbon content of less than 0.008 wt% . Bar iron is a generic term sometimes used to distinguish it from cast iron. It is the equivalent of an ingot of cast metal, in a convenient form for handling, storage, shipping and further working into a finished product. The bars were the usual product of the finery forge , but not necessarily made by that process: Wrought iron is a form of commercial iron containing less than 0.10% of carbon, less than 0.25% of impurities total of sulfur, phosphorus, silicon and manganese, and less than 2% slag by weight. Wrought iron

496-635: A central shaft of horizontal wrought iron paddles. The valve regulating the flow of acid into the nitrator was operated by a wire several hundred feet away. The operator would periodically run close enough to the nitrator to read the thermometer and run back to safety. Cooling was accomplished by running cold spring water over the top and sides of the nitrator, keeping the reaction within a range of five degrees Fahrenheit. This procedure resulted in 7,000 to 8,000 pounds (3175 – 3628 kg) of nitrobenzene per batch. In 1883 he established himself in Baltimore as

620-418: A chemist and manufacturer of chemical products; and decided that there was a wide field for improvement in the methods then in use in chemical factories. Applying his skills he made tremendous advances in the chemistry business, mainly in the methods of dyeing cotton fabrics; and between 1890 and 1895 he obtained 15 or 20 patents for his chemical processes, one of the most important patents being his process for

744-592: A distillation column, he used an old boiler shell connected with a condensing coil but the benzene quality was poor. He then consulted with a distillation expert, James A. Moffett, who was operating the Camden branch of the Standard Oil Company of Parkersburg, Moffett was convinced that dye manufacturing could be profitable and invested money in Bloede & Rathbone. Dye manufacturing was organized as

868-470: A final product. Sometimes European ironworks would skip the shingling process completely and roll the puddle balls. The only drawback to that is that the edges of the rough bars were not as well compressed. When the rough bar was reheated, the edges might separate and be lost into the furnace. The bloom was passed through rollers and to produce bars. The bars of wrought iron were of poor quality, called muck bars or puddle bars. To improve their quality,

992-463: A high silky luster and fibrous appearance. Wrought iron lacks the carbon content necessary for hardening through heat treatment , but in areas where steel was uncommon or unknown, tools were sometimes cold-worked (hence cold iron ) to harden them. An advantage of its low carbon content is its excellent weldability. Furthermore, sheet wrought iron cannot bend as much as steel sheet metal when cold worked. Wrought iron can be melted and cast; however,

1116-778: A large hole into which an additional 4,000 prisoners were to be disposed of. During the war, Dresden was the location of several forced labour subcamps of the Stalag IV-A prisoner-of-war camp for Allied POWs, and seven subcamps of the Flossenbürg concentration camp , in which some 3,600 men, women and children were imprisoned, mostly Polish , Jewish and Russian. In April 1945, most surviving prisoners were sent on death marches to various destinations in Saxony and German-occupied Czechoslovakia , whereas some women were probably murdered and some managed to escape. Dresden in

1240-434: A low scale to supply the steel to the artisan swordmakers. Osmond iron consisted of balls of wrought iron, produced by melting pig iron and catching the droplets on a staff, which was spun in front of a blast of air so as to expose as much of it as possible to the air and oxidise its carbon content. The resultant ball was often forged into bar iron in a hammer mill. In the 15th century, the blast furnace spread into what

1364-449: A lower melting point than iron or steel. Cast and especially pig iron have excess slag which must be at least partially removed to produce quality wrought iron. At foundries it was common to blend scrap wrought iron with cast iron to improve the physical properties of castings. For several years after the introduction of Bessemer and open hearth steel, there were different opinions as to what differentiated iron from steel; some believed it

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1488-597: A major Nazi museum director and art dealer, to hide a large collection of artwork worth tens of millions of dollars that had been stolen during the Nazi era, as he claimed it had been destroyed along with his house which was located in Dresden. The Allies described the operation as the legitimate bombing of a military and industrial target. Several researchers have argued that the February attacks were disproportionate . As

1612-522: A major cultural centre of historical memory, owing to the city's destruction in World War II. Each year on 13 February, the anniversary of the British and American fire-bombing raid that destroyed most of the city, tens of thousands of demonstrators gather to commemorate the event. Since reunification, the ceremony has taken on a more neutral and pacifist tone (after being used more politically during

1736-459: A modest amount of wrought iron was refined into steel , which was used mainly to produce swords , cutlery , chisels , axes , and other edged tools, as well as springs and files. The demand for wrought iron reached its peak in the 1860s, being in high demand for ironclad warships and railway use. However, as properties such as brittleness of mild steel improved with better ferrous metallurgy and as steel became less costly to make thanks to

1860-693: A number of medals for his various useful and economic inventions, he also proved himself a benefactor to society in general. On November 10, 1908, he presented the Hospital for Consumptives of Maryland (a tuberculosis sanitorium ), with a new building. The institution, which came to be known as the Eudowood Sanitorium, began operation in June 1899, existed on a 23 acre (0.093 km²) campus in Towson, Maryland until July 1964. Bloede's structure

1984-603: A number of patented processes for that, which are referred to today as potting and stamping . The earliest were developed by John Wood of Wednesbury and his brother Charles Wood of Low Mill at Egremont , patented in 1763. Another was developed for the Coalbrookdale Company by the Cranage brothers . Another important one was that of John Wright and Joseph Jesson of West Bromwich . A number of processes for making wrought iron without charcoal were devised as

2108-410: A process for manufacturing wrought iron quickly and economically. It involved taking molten steel from a Bessemer converter and pouring it into cooler liquid slag. The temperature of the steel is about 1500 °C and the liquid slag is maintained at approximately 1200 °C. The molten steel contains a large amount of dissolved gases so when the liquid steel hit the cooler surfaces of the liquid slag

2232-488: A purpose in life, seek associates among those to whom you can look up, observe men and women of strong character. One of his sisters was a noted poet, Gertrude Bloede (1845-1905). His other two sisters were Kate (1848-1891; who married the American artist, naturalist and teacher Abbott Handerson Thayer ), and Indiana "Indie" (1854-1936; married Samuel Thomas King, a New York City area physician and surgeon). His grandson

2356-629: A record calling the place "Civitas Dresdene". After 1270, Dresden became the capital of the margraviate. It was given to Friedrich Clem after the death of Henry the Illustrious in 1288. It was taken by the Margraviate of Brandenburg in 1316 and was restored to the Wettin dynasty after the death of Valdemar the Great in 1319. From 1485, it was the seat of the dukes of Saxony , and from 1547

2480-410: A refinery where raw coal was used to remove silicon and convert carbon within the raw material, found in the form of graphite, to a combination with iron called cementite. In the fully developed process (of Hall), this metal was placed into the hearth of the puddling furnace where it was melted. The hearth was lined with oxidizing agents such as haematite and iron oxide. The mixture was subjected to

2604-414: A result of inadequate Nazi air raid measures for refugees, mostly women and children died. American author Kurt Vonnegut 's novel Slaughterhouse Five is loosely based on his first-hand experience of the raid as a prisoner of war . In remembrance of the victims, the anniversaries of the bombing of Dresden are marked with peace demonstrations, devotions and marches. Following his military service

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2728-550: A separate entity named the American Aniline Works. The founders of the new company had little dye-making experience so they read German texts on the subject. There was no money left for new equipment, so they had to rely on scrapped equipment they obtained from the Standard Oil junk pile. Instead of a heavy cast iron nitrator, an old boiler shell with a capacity of 1,000 gallons (3785 Litres) was fitted with

2852-481: A single hearth for all stages. The introduction of coke for use in the blast furnace by Abraham Darby in 1709 (or perhaps others a little earlier) initially had little effect on wrought iron production. Only in the 1750s was coke pig iron used on any significant scale as the feedstock of finery forges. However, charcoal continued to be the fuel for the finery. From the late 1750s, ironmasters began to develop processes for making bar iron without charcoal. There were

2976-471: A skeleton previously used as a model for drawing art classes was found in the ruins of the Dresden Art Academy, the photographer Edmund Kesting with the assistance of Peter posed it in a number of different locations to produce a series of haunting photographic images to give the impression that Death was wandering through the city in search of the dead. Kesting subsequently published them in

3100-443: A small amount of silicate slag forged out into fibers. It comprises around 99.4% iron by mass. The presence of slag can be beneficial for blacksmithing operations, such as forge welding, since the silicate inclusions act as a flux and give the material its unique, fibrous structure. The silicate filaments in the slag also protect the iron from corrosion and diminish the effect of fatigue caused by shock and vibration. Historically,

3224-684: A small chemical company in Brooklyn, New York , along the Gowanus creek canal . There he began to study chemical manufacturing and pharmaceutical preparations. In 1873 Bloede moved to Pomeroy, Ohio , the center of salt manufacturing along the Ohio River . He joined the Oakes & Rathbone Company in Parkersburg, West Virginia , which produced sulfuric acid for the bromine distillers in

3348-412: A strong current of air and stirred with long bars, called puddling bars or rabbles, through working doors. The air, the stirring, and the "boiling" action of the metal helped the oxidizing agents to oxidize the impurities and carbon out of the pig iron. As the impurities oxidize, they formed a molten slag or drifted off as gas, while the remaining iron solidified into spongy wrought iron that floated to

3472-920: A wasteland before it was rebuilt in the socialist style at the beginning of the 1960s. However, the majority of historic buildings were saved or reconstructed. Among them were the Ständehaus (1946), the Augustusbrücke (1949), the Kreuzkirche (until 1955), the Zwinger (until 1963), the Catholic Court Church (until 1965), the Semperoper (until 1985), the Japanese Palace (until 1987) and the two largest train stations. Some of this work dragged on for decades, often interrupted by

3596-407: A wealth of enjoyment in his mental exercises. Perseverance he believed, is the secret of success. He said: Never give up an undertaking because it is hard and unpromising, but persist until you succeed. I have observed that men seldom fail to accomplish any task or aim which they have set before them when their motto is 'Never give up trying'. Persistence is the great single element in success. Have

3720-424: Is redshort or hot short if it contains sulfur in excess quantity. It has sufficient tenacity when cold, but cracks when bent or finished at a red heat. Hot short iron was considered unmarketable. Cold short iron, also known as coldshear , colshire , contains excessive phosphorus. It is very brittle when cold and cracks if bent. It may, however, be worked at high temperature. Historically, coldshort iron

3844-414: Is a more important measure of the quality of wrought iron. In tensile testing, the best irons are able to undergo considerable elongation before failure. Higher tensile wrought iron is brittle. Because of the large number of boiler explosions on steamboats in the early 1800s, the U.S. Congress passed legislation in 1830 which approved funds for correcting the problem. The treasury awarded a $ 1500 contract to

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3968-547: Is a relatively recent city that grew from a Slavic village after Germans came to dominate the area, the area had been settled in the Neolithic era by Linear Pottery culture tribes c. 7500 BC . Dresden's founding and early growth is associated with the eastward expansion of Germanic peoples , mining in the nearby Ore Mountains , and the establishment of the Margraviate of Meissen . Its name comes from Sorbian Drježdźany (current Upper Sorbian form), meaning "people of

4092-450: Is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure . Wrought iron is tough, malleable, ductile , corrosion resistant, and easily forge welded , but is more difficult to weld electrically. Before the development of effective methods of steelmaking and the availability of large quantities of steel, wrought iron

4216-532: Is about 150 kilometres (93 miles) to the south and Wrocław (Poland) 200 kilometres (120 miles) to the east. Dresden is one of the greenest cities in all of Europe, with 62% of the city being green areas and forests. The Dresden Heath ( Dresdner Heide ) to the north is a forest 50 km (19 sq mi) in size. There are four nature reserves . The additional Special Conservation Areas cover 18 km (6.9 sq mi). The protected gardens, parkways, parks and old graveyards host 110 natural monuments in

4340-520: Is an archaic past participle of the verb "to work", and so "wrought iron" literally means "worked iron". Wrought iron is a general term for the commodity, but is also used more specifically for finished iron goods, as manufactured by a blacksmith . It was used in that narrower sense in British Customs records, such manufactured iron was subject to a higher rate of duty than what might be called "unwrought" iron. Cast iron , unlike wrought iron,

4464-435: Is brittle and cannot be worked either hot or cold. In the 17th, 18th, and 19th centuries, wrought iron went by a wide variety of terms according to its form, origin, or quality. While the bloomery process produced wrought iron directly from ore, cast iron or pig iron were the starting materials used in the finery forge and puddling furnace . Pig iron and cast iron have higher carbon content than wrought iron, but have

4588-491: Is deceptive. Most of the manganese, sulfur, phosphorus, and silicon in the wrought iron are incorporated into the slag fibers, making wrought iron purer than plain carbon steel. Amongst its other properties, wrought iron becomes soft at red heat and can be easily forged and forge welded . It can be used to form temporary magnets , but it cannot be magnetized permanently, and is ductile , malleable , and tough . For most purposes, ductility rather than tensile strength

4712-595: Is dominated by high-tech branches , often called " Silicon Saxony ". According to the Hamburg Institute of International Economics (HWWI) and Berenberg Bank in 2019, Dresden had the seventh best prospects for the future of all cities in Germany. Dresden is one of the most visited cities in Germany with 4.7 million overnight stays per year. Its most prominent building is the Frauenkirche located at

4836-407: Is no longer manufactured commercially. Wrought iron was originally produced by a variety of smelting processes, all described today as "bloomeries". Different forms of bloomery were used at different places and times. The bloomery was charged with charcoal and iron ore and then lit. Air was blown in through a tuyere to heat the bloomery to a temperature somewhat below the melting point of iron. In

4960-450: Is no longer produced on a commercial scale. Many products described as wrought iron, such as guard rails , garden furniture , and gates are made of mild steel. They are described as "wrought iron" only because they have been made to resemble objects which in the past were wrought (worked) by hand by a blacksmith (although many decorative iron objects, including fences and gates, were often cast rather than wrought). The word "wrought"

5084-628: Is now Belgium where it was improved. From there, it spread via the Pays de Bray on the boundary of Normandy and then to the Weald in England. With it, the finery forge spread. Those remelted the pig iron and (in effect) burnt out the carbon, producing a bloom, which was then forged into bar iron. If rod iron was required, a slitting mill was used. The finery process existed in two slightly different forms. In Great Britain, France, and parts of Sweden, only

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5208-457: Is the 12th most populous city of Germany, the fourth largest by area (after Berlin , Hamburg , and Cologne ), and the third most populous city in the area of former East Germany , after Berlin and Leipzig. Dresden's urban area comprises the towns of Freital , Pirna , Radebeul , Meissen , Coswig , Radeberg and Heidenau and has around 790,000 inhabitants. The Dresden metropolitan area has approximately 1.34 million inhabitants. Dresden

5332-837: Is the second largest city on the River Elbe after Hamburg. Most of the city's population lives in the Elbe Valley , but a large, albeit very sparsely populated, area of the city east of the Elbe lies in the West Lusatian Hill Country and Uplands (the westernmost part of the Sudetes ) and thus in Lusatia . Many boroughs west of the Elbe lie in the Ore Mountain Foreland , as well as in the valleys of

5456-555: The Bessemer process and the Siemens–Martin process , the use of wrought iron declined. Many items, before they came to be made of mild steel , were produced from wrought iron, including rivets , nails , wire , chains , rails , railway couplings , water and steam pipes , nuts , bolts , horseshoes , handrails , wagon tires, straps for timber roof trusses , and ornamental ironwork , among many other things. Wrought iron

5580-467: The Cold War ). Beginning in 1999, right-wing Neo-Nazi white nationalist groups have organised demonstrations in Dresden that have been among the largest of their type in the post-war history of Germany . Each year around the anniversary of the city's destruction, people convene in the memory of those who died in the fire-bombing. The completion of the reconstructed Dresden Frauenkirche in 2005 marked

5704-488: The Cooper Institute . He graduated in 1867, earning a degree in engineering at the age of 18. He was also privileged to have been a personal acquaintance of Peter Cooper , the great industrialist, inventor, philanthropist, and founder of the institution, whose example and teachings were strongly influential in molding Victor's character and in his life work. In 1868 Bloede secured a position at Chemical Works,

5828-547: The Elbe to flood 9 metres (30 ft) above its normal height, i.e., even higher than the old record height from 1845, damaging many landmarks (see 2002 European floods ). The destruction from this "millennium flood" is no longer visible, due to the speed of reconstruction. The United Nations' cultural organization UNESCO declared the Dresden Elbe Valley to be a World Heritage Site in 2004. After being placed on

5952-741: The Elbe , mostly in the Dresden Basin , with the further reaches of the eastern Ore Mountains to the south, the steep slope of the Lusatian granitic crust to the north, and the Elbe Sandstone Mountains to the east at an altitude of about 113 metres (371 feet). Triebenberg is the highest point in Dresden at 384 metres (1,260 feet). With a pleasant location and a mild climate on the Elbe, as well as Baroque-style architecture and numerous world-renowned museums and art collections, Dresden has been called "Elbflorenz" ( Florence on

6076-704: The Group of Soviet Forces in Germany after the war. Apart from the German army officers' school ( Offizierschule des Heeres ), there have been no more military units in Dresden since the army merger during German reunification, and the withdrawal of Soviet forces in 1992. Nowadays, the Bundeswehr operates the Military History Museum of the Federal Republic of Germany in the former Albertstadt garrison. Two book burnings were organised in

6200-664: The Grünes Gewölbe and the Mathematisch-Physikalischer Salon . Strengthening ties with Poland, postal routes to Poznań , Toruń and Warsaw were established under Augustus II the Strong. In 1726 there was a riot for two days after a Protestant clergyman was killed by a soldier who had recently converted from Catholicism. In 1745, the Treaty of Dresden between Prussia, Saxony, and Austria ended

6324-481: The Industrial Revolution began during the latter half of the 18th century. The most successful of those was puddling, using a puddling furnace (a variety of the reverberatory furnace ), which was invented by Henry Cort in 1784. It was later improved by others including Joseph Hall , who was the first to add iron oxide to the charge. In that type of furnace, the metal does not come into contact with

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6448-722: The Julia Howard , arriving in New York on August 21. Upon coming to the United States , Gustav Bloede served as a surgeon in the American Civil War . After the war the family settled in Brooklyn, New York . The cultured Bloede home became a salon, which attracted such 19th-century figures as Thomas Bailey Aldrich . Victor received the groundwork of his education in public school and by the age of 12 he began to support himself by working as an office boy and earned

6572-635: The Neumarkt . Built in the 18th century, the church was destroyed during World War II. The remaining ruins were left for 50 years as a war memorial, before being rebuilt between 1994 and 2005. Other famous landmarks include the Zwinger , the Semperoper and Dresden Castle . Furthermore, the city is home to the renowned Dresden State Art Collections , originating from the collections of the Saxon electors in

6696-671: The Second Silesian War . Only a few years later, Dresden suffered heavy destruction in the Seven Years' War (1756–1763), following its capture by Prussian forces, its subsequent re-capture, and a failed Prussian siege in 1760. Friedrich Schiller completed his Ode to Joy (the literary base of the European anthem ) in Dresden in 1785. In 1793, preparations for the Polish Kościuszko Uprising started in

6820-706: The Semper Opera House and the Zwinger Palace , although the city leaders chose to rebuild large areas of the city in a "socialist modern" style, partly for economic reasons, but also to break away from the city's past as the royal capital of Saxony and a stronghold of the German bourgeoisie. Until the end of the Cold War, the 1st Guards Tank Army of the Soviet Army and the 7th Panzer Division of

6944-501: The Walloon process was used. That employed two different hearths, a finery hearth for finishing the iron and a chafery hearth for reheating it in the course of drawing the bloom out into a bar. The finery always burnt charcoal, but the chafery could be fired with mineral coal , since its impurities would not harm the iron when it was in the solid state. On the other hand, the German process, used in Germany, Russia, and most of Sweden used

7068-524: The bloomery ever being used in China. The fining process involved liquifying cast iron in a fining hearth and removing carbon from the molten cast iron through oxidation . Wagner writes that in addition to the Han dynasty hearths believed to be fining hearths, there is also pictorial evidence of the fining hearth from a Shandong tomb mural dated 1st to 2nd century AD, as well as a hint of written evidence in

7192-428: The electors as well. The Elector and ruler of Saxony Frederick Augustus I became King Augustus II the Strong of Poland in 1697. He gathered many of the best musicians, architects and painters from all over Europe to Dresden. His reign marked the beginning of Dresden's emergence as a leading European city for technology and art. During the reign of Kings Augustus II the Strong and Augustus III of Poland most of

7316-413: The finery forge at least by the 2nd century BC, the earliest specimens of cast and pig iron fined into wrought iron and steel found at the early Han dynasty site at Tieshengguo. Pigott speculates that the finery forge existed in the previous Warring States period (403–221 BC), due to the fact that there are wrought iron items from China dating to that period and there is no documented evidence of

7440-1203: The 16th century. Dresden's Striezelmarkt is one of the largest Christmas markets in Germany and is considered the first genuine Christmas market in the world. Nearby sights include the National Park of Saxon Switzerland , the Ore Mountains and the countryside around Elbe Valley , Moritzburg Castle and Meissen , home of Meissen porcelain . [REDACTED] Margravate of Meissen , 1319–1423 [REDACTED] Electorate of Saxony , 1423–1806 [REDACTED] Kingdom of Saxony , 1806–1848 [REDACTED] German Empire , 1848–1849 [REDACTED] Kingdom of Saxony , 1849–1918 [REDACTED] North German Confederation ( Kingdom of Saxony ), 1867–1871 [REDACTED] German Empire ( Kingdom of Saxony ), 1867–1918 [REDACTED] Weimar Republic ( Free State of Saxony ), 1918–1933 [REDACTED] Nazi Germany , 1933–1945 [REDACTED] Soviet occupation zone of Germany , 1945–1949 [REDACTED] East Germany , 1949–1990 [REDACTED]   Germany ( Free State of Saxony ), 1990–present Although Dresden

7564-701: The 1960s, the price of steel production was dropping due to recycling, and even using the Aston process, wrought iron production was labor-intensive. It has been estimated that the production of wrought iron is approximately twice as expensive as that of low-carbon steel. In the United States, the last plant closed in 1969. The last in the world was the Atlas Forge of Thomas Walmsley and Sons in Bolton , Great Britain, which closed in 1973. Its 1860s-era equipment

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7688-413: The 20th century was a major communications hub and manufacturing centre with 127 factories and major workshops and was designated by the German military as a defensive strongpoint, with which to hinder the Soviet advance. Being the capital of the German state of Saxony , Dresden not only had garrisons but a whole military borough , the Albertstadt . This military complex, named after Saxon King Albert,

7812-418: The 4th century AD Daoist text Taiping Jing . Wrought iron has been used for many centuries, and is the "iron" that is referred to throughout Western history. The other form of iron, cast iron , was in use in China since ancient times but was not introduced into Western Europe until the 15th century; even then, due to its brittleness, it could be used for only a limited number of purposes. Throughout much of

7936-408: The Altmarkt. From 1955 to 1958, a large part of the art treasures looted by the Soviet Union was returned, which meant that from 1960 onwards many state art collections could be opened in reconstructed facilities or interim exhibitions. Important orchestras such as the Staatskapelle performed in alternative venues (for example in the Kulturpalast from 1969). Some cultural institutions were moved out of

8060-417: The Elbe). The incorporation of neighbouring rural communities over the past 60 years has made Dresden the fourth largest urban district by area in Germany after Berlin, Hamburg and Cologne . The nearest German cities are Chemnitz 62 kilometres (39 miles) to the southwest, Leipzig 100 kilometres (62 miles) to the northwest and Berlin 165 kilometres (103 miles) to the north. Prague (Czech Republic)

8184-400: The Franklin Institute to conduct a study. As part of the study, Walter R. Johnson and Benjamin Reeves conducted strength tests on boiler iron using a tester they had built in 1832 based on a design by Lagerhjelm in Sweden. Because of misunderstandings about tensile strength and ductility, their work did little to reduce failures. The importance of ductility was recognized by some very early in

8308-446: The German average, with a January average temperature of 0.1 °C (32.18 °F). The driest months are February, March and April, with precipitation of around 40 mm (1.6 in). The wettest months are July and August, with more than 80 mm (3.1 in) per month. Wrought iron Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It

8432-463: The German press photographer and photojournalist Richard Peter returned to Dresden and began to document the ruined city. Among his best known works Blick auf Dresden vom Rathausturm ( View of Dresden from the Rathaus Tower ). It has become one of the best known photographs of a ruined post-war Germany following its appearance in 1949 in his book Dresden, eine Kamera klagt an ("Dresden, a photographic accusation", ISBN   3-930195-03-8 ). When

8556-482: The Middle Ages, iron was produced by the direct reduction of ore in manually operated bloomeries , although water power had begun to be employed by 1104. The raw material produced by all indirect processes is pig iron. It has a high carbon content and as a consequence, it is brittle and cannot be used to make hardware. The osmond process was the first of the indirect processes, developed by 1203, but bloomery production continued in many places. The process depended on

8680-415: The National People's Army were stationed in and around Dresden. Following reunification in 1989, the Soviet / Russian troops were withdrawn from Germany in the early 1990s and the NVA dissolved in accordance with the provisions of the Two-Plus-Four Treaty of 1990 . From 1985 to 1990, the future President of Russia, Vladimir Putin , was stationed in Dresden by the KGB , where he worked for Lazar Matveev ,

8804-412: The Polish uprisings of 1831 , 1848 and 1863 many Poles fled to Dresden, including the artistic and political elite, such as composer Frédéric Chopin , war hero Józef Bem and writer Adam Mickiewicz . Mickiewicz wrote one of his greatest works, Dziady , Part III , there. Dresden itself was a centre of the German Revolutions in 1848–1849 with the May Uprising , which cost human lives and damaged

8928-451: The bars were cut up, piled and tied together by wires, a process known as faggoting or piling. They were then reheated to a welding state, forge welded, and rolled again into bars. The process could be repeated several times to produce wrought iron of desired quality. Wrought iron that has been rolled multiple times is called merchant bar or merchant iron. The advantage of puddling was that it used coal, not charcoal as fuel. However, that

9052-853: The bombing saved their lives. The Semper Synagogue was destroyed in November 1938 on Kristallnacht . During the German invasion of Poland at the start of World War II , in September 1939, the Gestapo carried out mass arrests of local Polish activists. Other non-Jews were also targeted, and over 1,300 people were executed by the Nazis at the Münchner Platz, a courthouse in Dresden, including labour leaders, undesirables, resistance fighters and anyone caught listening to foreign radio broadcasts. The bombing stopped prisoners who were busy digging

9176-582: The book Dresdner Totentanz ( Dresden's Death Dance ). The damage from the Allied air raids was so extensive that following the end of the Second World War, a narrow gauge light railway system was constructed to remove the debris, though being makeshift there were frequent derailments. This railway system, which had seven lines, employed 5,000 staff and 40 locomotives, all of which bore women's names. The last train remained in service until 1958, though

9300-916: The city by Tadeusz Kościuszko in response to the Second Partition of Poland . In 1806, Dresden became the capital of the Kingdom of Saxony established by Napoleon . During the Napoleonic Wars the French Emperor made it a base of operations , winning there the Battle of Dresden on 27 August 1813. As a result of the Congress of Vienna , the Kingdom of Saxony became part of the German Confederation in 1815. Following

9424-542: The city center (for example the state library in Albertstadt). The Outer Neustadt, which was almost undamaged during the war was threatened with demolition in the 1980s following years of neglect, but was preserved following public protests. To house the homeless large prefabricated housing estates were built on previously undeveloped land In Prohlis and Gorbitz. Damaged housing in the Johannstadt and other areas in

9548-578: The city center were demolished and replaced with large apartment blocks. The villa districts in Blasewitz, Striesen, Kleinzschachwitz, Loschwitz and on the Weißen Hirsch were largely preserved. Dresden became a major industrial centre of East Germany, with a great deal of research infrastructure. It was the centre of Bezirk Dresden (Dresden District) between 1952 and 1990. Many of the city's important historic buildings were reconstructed, including

9672-610: The city in 1933, one by the SA on Wettiner Platz, the second one by German Student Union at the Bismarck Column on Räcknitzhöhe. During the Nazi era from 1933 to 1945, the Jewish community of Dresden was reduced from over 6,000 (7,100 people were persecuted as Jews) to 41, mostly as a result of emigration, but later also deportation and murder. One of the survivors was Victor Klemperer with his non-Jewish wife, who believed that

9796-973: The city's baroque landmarks were built. These include the Zwinger Royal Palace , the Japanese Palace , the Taschenbergpalais , the Pillnitz Castle and the two landmark churches: the Catholic Hofkirche and the Lutheran Frauenkirche . In addition, significant art collections and museums were founded. Notable examples include the Dresden Porcelain Collection , the Collection of Prints, Drawings and Photographs ,

9920-635: The city. The Dresden Elbe Valley is a former world heritage site which is focused on the conservation of the cultural landscape in Dresden. One important part of that landscape is the Elbe meadows, which cross the city in a 20 kilometre swath. Saxon Switzerland is located south-east of the city. Like most of eastern Germany, Dresden has an oceanic climate ( Köppen climate classification Cfb ), with significant continental influences due to its inland location. The summers are warm, averaging 19.0 °C (66.2 °F) in July. The winters are slightly colder than

10044-413: The course of the smelt, slag would melt and run out, and carbon monoxide from the charcoal would reduce the ore to iron, which formed a spongy mass (called a "bloom") containing iron and also molten silicate minerals (slag) from the ore. The iron remained in the solid state. If the bloomery were allowed to become hot enough to melt the iron, carbon would dissolve into it and form pig or cast iron, but that

10168-593: The development of the blast furnace, of which medieval examples have been discovered at Lapphyttan , Sweden and in Germany . The bloomery and osmond processes were gradually replaced from the 15th century by finery processes, of which there were two versions, the German and Walloon. They were in turn replaced from the late 18th century by puddling , with certain variants such as the Swedish Lancashire process . Those, too, are now obsolete, and wrought iron

10292-604: The dyeing "sun-fast", unfading shades. In 1906, Bloede organized the Avalon Water Works and the Patapsco Electric & Manufacturing Co. He financed the construction of Bloede's Dam , a hydroelectric dam which impounds the Patapsco River to serve as a power generating plant for the Patapsco Electric & Manufacturing Company, a service providing electricity to Catonsville, Maryland and

10416-514: The first step in rebuilding the Neumarkt area. The areas around the square were divided into eight "quarters", with each being rebuilt as a separate project, the majority of buildings to be rebuilt either to the original structure or at least with a facade similar to the original. The quarters I, II, IV, V, VI and VIII have since been completed; quarters III and quarter VII were still partly under construction in 2020. In 2002, torrential rains caused

10540-404: The following years, the city became a major centre of economy, including motor car production, food processing, banking and the manufacture of medical equipment . In the early 20th century, Dresden was particularly well known for its camera works and its cigarette factories. During World War I , the city did not suffer any war damage, but lost many of its inhabitants. Between 1918 and 1934, Dresden

10664-562: The forest", from Proto-Slavic *dręzga ("woods, blowdowns"). Dresden later evolved into the capital of Saxony . Around the late 12th century, a Sorbian settlement called Drežďany (meaning either "woods" or "lowland forest-dweller" ) had developed on the southern bank. Another settlement existed on the northern bank, but its Slavic name is unknown. It was known as Antiqua Dresdin by 1350, and later as Altendresden, both literally "old Dresden". Dietrich, Margrave of Meissen , chose Dresden as his interim residence in 1206, as documented in

10788-432: The fuel, and so is not contaminated by its impurities. The heat of the combustion products passes over the surface of the puddle and the roof of the furnace reverberates (reflects) the heat onto the metal puddle on the fire bridge of the furnace. Unless the raw material used is white cast iron, the pig iron or other raw product of the puddling first had to be refined into refined iron , or finers metal. That would be done in

10912-401: The gases were liberated. The molten steel then froze to yield a spongy mass having a temperature of about 1370 °C. The spongy mass would then be finished by being shingled and rolled as described under puddling (above). Three to four tons could be converted per batch with the method. Steel began to replace iron for railroad rails as soon as the Bessemer process for its manufacture

11036-526: The historic inner city. Since German reunification in 1990, Dresden has once again become a cultural, educational and political centre of Germany. The Dresden University of Technology (TU Dresden) is one of the 10 largest universities in Germany and part of the German Universities Excellence Initiative . The economy of Dresden and its agglomeration is one of the most dynamic in Germany and ranks first in Saxony. It

11160-498: The historic town of Dresden. The uprising forced Frederick Augustus II of Saxony to flee from Dresden, but he soon after regained control over the city with the help of Prussia. In 1852, the population of Dresden grew to 100,000 inhabitants, making it one of the biggest cities within the German Confederation. As the capital of the Kingdom of Saxony, Dresden became part of the newly founded German Empire in 1871. In

11284-814: The hospital complex, a barn that was originally part of the Stansbury farm that previously existed there, still stands. Bloede was the underwriter of many other important benefactions and made many improvements in his home town of Catonsville, Maryland . Bloede was an active member of a number of scientific associations, including: His scientific writings include: Invented the adhesive on postage stamps and envelopes. On June 5, 1883, he married Elise Schon, daughter Carl Schon Sr. from Toledo, Ohio , who designed and built summer cottages on Eden Terrace in Catonsville. Earlier, he had designed many buildings in Toledo and

11408-430: The iron. The included slag in wrought iron also imparts corrosion resistance. Antique music wire , manufactured at a time when mass-produced carbon-steels were available, was found to have low carbon and high phosphorus; iron with high phosphorus content, normally causing brittleness when worked cold, was easily drawn into music wires. Although at the time phosphorus was not an easily identified component of iron, it

11532-631: The last official debris clearance team was only disbanded in 1977. Rather than repair them, German Democratic Republic (East Germany) authorities razed the ruins of many churches, royal buildings and palaces in the 1950s and 1960s, such as the Gothic Sophienkirche , the Alberttheater and the Wackerbarth-Palais as well as many historic residential buildings. The surroundings of the once lively Prager Straße resembled

11656-501: The list of endangered World Heritage Sites in 2006, the city lost the title in June 2009, due to the construction of the Waldschlößchenbrücke , making it only the second ever World Heritage Site to be removed from the register. UNESCO stated in 2006 that the bridge would destroy the cultural landscape. The city council's legal moves, meant to prevent the bridge from being built, failed. Dresden lies on both banks of

11780-723: The means to pursue his studies. While working by day he studied at night at the Cooper Institute (more properly known as Cooper Union ) in New York City , where he was mentored by Peter Cooper . His mother, Marie Bloede was his chief inspiration, guiding, encouraging, and strengthening his growth. His family was one of marked culture, not only had his father distinguished himself by work in natural sciences, but on his mother's side as well, two uncles had been prominent in literature and politics. Like his father, Victor also became interested in natural science as he studied at

11904-514: The mid 19th century, in Austria as the stuckofen to 1775, and near Garstang in England until about 1770; it was still in use with hot blast in New York in the 1880s. In Japan the last of the old tatara bloomeries used in production of traditional tamahagane steel, mainly used in swordmaking, was extinguished only in 1925, though in the late 20th century the production resumed on

12028-593: The overall economic situation in the GDR. The ruins of the Frauenkirche were allowed to remain on Neumarkt as a memorial to the war. While the Theater and Schloßplatz were rebuilt in accordance with the historical model in 1990, the Neumarkt remained completely undeveloped. On the other hand buildings of socialist classicism and spatial design and orientation according to socialist ideals (e.g. Kulturpalast) were built at

12152-666: The product is no longer wrought iron, since the slag stringers characteristic of wrought iron disappear on melting, so the product resembles impure, cast, Bessemer steel. There is no engineering advantage to melting and casting wrought iron, as compared to using cast iron or steel, both of which are cheaper. Due to the variations in iron ore origin and iron manufacture, wrought iron can be inferior or superior in corrosion resistance, compared to other iron alloys. There are many mechanisms behind its corrosion resistance. Chilton and Evans found that nickel enrichment bands reduce corrosion. They also found that in puddled, forged, and piled iron,

12276-530: The region. The plant was located on the south side of the Little Kanawha River a tributary of the Ohio River. Oakes left the firm in 1875 and Bloede acquired his interests, the company became known as Bloede & Rathbone. The product line was extended to iron sulfates , iron nitrate , tin salts, mordants and other chemicals used mainly by the textile industry. Bloede's familiarity with

12400-475: The removal of the communist government. Dresden has experienced dramatic changes since the reunification of Germany in the early 1990s. The city still bears many wounds from the bombing raids of 1945, but it has undergone significant reconstruction. Restoration of the Dresden Frauenkirche, a Lutheran church, began in 1994 and was completed in 2005, a year before Dresden's 800th anniversary; this

12524-574: The rivers rising there and flowing through Dresden, the longest of which are the Weißeritz and the Lockwitzbach . The name of the city as well as the names of most of its boroughs and rivers are of Sorbian origin. Dresden has a long history as the capital and royal residence for the Electors and Kings of Saxony , who for centuries furnished the city with cultural and artistic splendor, and

12648-531: The same manner as mild steel, but the presence of oxide or inclusions will give defective results. The material has a rough surface, so it can hold platings and coatings better than smooth steel. For instance, a galvanic zinc finish applied to wrought iron is approximately 25–40% thicker than the same finish on steel. In Table 1, the chemical composition of wrought iron is compared to that of pig iron and carbon steel . Although it appears that wrought iron and plain carbon steel have similar chemical compositions, that

12772-546: The senior KGB liaison officer there. On 3 October 1989 (the so-called "battle of Dresden"), a convoy of trains carrying East German refugees from Prague passed through Dresden on its way to the Federal Republic of Germany . Local activists and residents joined in the growing civil disobedience movement spreading across the German Democratic Republic, by staging demonstrations and demanding

12896-843: The surrounding areas. Bloede's dam was the first known Hydroelectric dam of-its-kind in the country. He also organized the First National Bank of Catonsville, of which he was vice-president for 10 years, and in 1908 he was made president. He projected the Baltimore, Catonsville and Ellicott City Electric railway , and he helped to organize the National City Bank of Baltimore, in 1910 and became one of its directors. His performance gave him notability in other business relations which contributed to him being in great demand on various boards of directors. He died at his home in Catonsville, Maryland . While Bloede received

13020-466: The textile industry led to the idea of manufacturing aniline dyes to increase profits. At the time most dyes were imported from Germany. There were only two companies producing dyes in the U.S. Bloede was determined to manufacture aniline by nitrating benzene to form nitrobenzene , followed by reduction. One problem he faced was to purify benzene from the light tar oils, which was supplied in barrels by coal tar distilleries and gas plants. Lacking

13144-465: The top of the puddle and was fished out of the melt as puddle balls, using puddle bars. There was still some slag left in the puddle balls, so while they were still hot they would be shingled to remove the remaining slag and cinder. That was achieved by forging the balls under a hammer, or by squeezing the bloom in a machine. The material obtained at the end of shingling is known as bloom. The blooms are not useful in that form, so they were rolled into

13268-560: The working-over of the metal spread out copper, nickel, and tin impurities that produce electrochemical conditions that slow down corrosion. The slag inclusions have been shown to disperse corrosion to an even film, enabling the iron to resist pitting. Another study has shown that slag inclusions are pathways to corrosion. Other studies show that sulfur in the wrought iron decreases corrosion resistance, while phosphorus increases corrosion resistance. Chloride ions also decrease wrought iron's corrosion resistance. Wrought iron may be welded in

13392-415: Was Victor Gustav Bloede III (1920-1999), an advertising executive with Benton & Bowles . Dresden Dresden ( / ˈ d r ɛ z d ən / , German: [ˈdʁeːsdn̩] ; Upper Saxon : Dräsdn ; Upper Sorbian : Drježdźany , pronounced [ˈdʁʲɛʒdʒanɨ] ) is the capital city of the German state of Saxony and its second most populous city after Leipzig . It

13516-479: Was adopted (1865 on). Iron remained dominant for structural applications until the 1880s, because of problems with brittle steel, caused by introduced nitrogen, high carbon, excess phosphorus, or excessive temperature during or too-rapid rolling. By 1890 steel had largely replaced iron for structural applications. Sheet iron (Armco 99.97% pure iron) had good properties for use in appliances, being well-suited for enamelling and welding, and being rust-resistant. In

13640-490: Was considered sufficient for nails . Phosphorus is not necessarily detrimental to iron. Ancient Near Eastern smiths did not add lime to their furnaces. The absence of calcium oxide in the slag, and the deliberate use of wood with high phosphorus content during the smelting, induces a higher phosphorus content (typically <0.3%) than in modern iron (<0.02–0.03%). Analysis of the Iron Pillar of Delhi gives 0.11% in

13764-686: Was controversial. On the night of 13–14 February 1945, 773 RAF Lancaster bombers dropped 1,181.6 tons of incendiary bombs and 1,477.7 tons of high explosive bombs, targeting the rail yards at the centre of the city. The inner city of Dresden was largely destroyed. Widely quoted Nazi propaganda reports claimed 200,000 deaths, but the German Dresden Historians' Commission, made up of 13 prominent German historians, in an official 2010 report published after five years of research concluded that casualties numbered between 22,500 and 25,000. The destruction of Dresden allowed Hildebrand Gurlitt ,

13888-626: Was dedicated as the Marie Bloede Memorial Hospital for Advanced Consumptives in honor of his mother and was one of several buildings that made up the facility. It was accepted by Dr. Henry Barton Jacobs , as president, in the presence of the Governor of Maryland, Austin Lane Crothers , Reverend Bishop William Paret , Mayor of Baltimore, J. Barry Mahool , and a large and distinguished gathering. The last remnant of

14012-541: Was done with the help of privately raised funds. The gold cross on the top of the church was funded officially by "the British people and the House of Windsor". The urban renewal process, which includes the reconstruction of the area around the Neumarkt square on which the Frauenkirche is situated, was expected to take decades, but numerous large projects were under way in the first part of the 21st century. Dresden remains

14136-515: Was hypothesized that the type of iron had been rejected for conversion to steel but excelled when tested for drawing ability. During the Han dynasty (202 BC – 220 AD), new iron smelting processes led to the manufacture of new wrought iron implements for use in agriculture, such as the multi-tube seed drill and iron plough . In addition to accidental lumps of low-carbon wrought iron produced by excessive injected air in ancient Chinese cupola furnaces . The ancient Chinese created wrought iron by using

14260-477: Was moved to the Blists Hill site of Ironbridge Gorge Museum for preservation. Some wrought iron is still being produced for heritage restoration purposes, but only by recycling scrap. The slag inclusions, or stringers , in wrought iron give it properties not found in other forms of ferrous metal. There are approximately 250,000 inclusions per square inch. A fresh fracture shows a clear bluish color with

14384-655: Was not specifically targeted in the bombing of Dresden . During the final months of the Second World War, Dresden harboured some 600,000 refugees, with a total population of 1.2 million . Dresden was attacked seven times between 1944 and 1945, and was occupied by the Red Army after the German capitulation . The bombing of Dresden by the Royal Air Force (RAF) and the United States Army Air Forces (USAAF) between 13 and 15 February 1945

14508-445: Was not the intention. However, the design of a bloomery made it difficult to reach the melting point of iron and also prevented the concentration of carbon monoxide from becoming high. After smelting was complete, the bloom was removed, and the process could then be started again. It was thus a batch process, rather than a continuous one such as a blast furnace. The bloom had to be forged mechanically to consolidate it and shape it into

14632-532: Was of little advantage in Sweden, which lacked coal. Gustaf Ekman observed charcoal fineries at Ulverston , which were quite different from any in Sweden. After his return to Sweden in the 1830s, he experimented and developed a process similar to puddling but used firewood and charcoal, which was widely adopted in the Bergslagen in the following decades. In 1925, James Aston of the United States developed

14756-475: Was once by personal union the family seat of Polish monarchs. The city was known as the Jewel Box, because of its Baroque and Rococo city centre. The controversial American and British bombing of Dresden towards the end of World War II killed approximately 25,000 people, most of whom were civilians, and destroyed the entire city centre. After the war, restoration work has helped to reconstruct parts of

14880-589: Was superintendent of the Toledo waterworks for over 15 years. With this marriage, he gained a lifelong companionship. Mr. and Mrs. Bloede had five children: Marie, Carl S, Ilse, Victor Gustav Bloede II, and Vida. Bloede had a strong personality, alert, progressive, and insightful. He believed in physical and mental exercise for a sound body and mind, he recommended to others which methods he himself had used and gained such success. In his free time he took interest in fishing, rowing and walking, he also enjoyed playing quoits and other games with family and friends and found

15004-644: Was the capital of the first Free State of Saxony as well as a cultural and economic centre of the Weimar Republic . The city was also a centre of European modern art until 1933. During the foundation of the German Empire in 1871, a large military facility called Albertstadt was built. It had a capacity of up to 20,000 military personnel at the beginning of the First World War . The garrison saw only limited use between 1918 and 1934, but

15128-473: Was the chemical composition and others that it was whether the iron heated sufficiently to melt and "fuse". Fusion eventually became generally accepted as relatively more important than composition below a given low carbon concentration. Another difference is that steel can be hardened by heat treating . Historically, wrought iron was known as "commercially pure iron"; however, it no longer qualifies because current standards for commercially pure iron require

15252-404: Was the most common form of malleable iron. It was given the name wrought because it was hammered, rolled, or otherwise worked while hot enough to expel molten slag. The modern functional equivalent of wrought iron is mild steel , also called low-carbon steel. Neither wrought iron nor mild steel contain enough carbon to be hardened by heating and quenching. Wrought iron is highly refined, with

15376-606: Was then reactivated in preparation for the Second World War . Its usefulness was limited by attacks on 13–15 February and 17 April 1945, the former of which destroyed large areas of the city. However, the garrison itself was not specifically targeted. Soldiers had been deployed as late as March 1945 in the Albertstadt garrison. The Albertstadt garrison became the headquarters of the Soviet 1st Guards Tank Army in

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