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Home Insurance Building

Home Insurance Building

The Home Insurance Building was built in 1885 in Chicago, Illinois and demolished in 1931 to make way for the Field Building (now the LaSalle National Bank). It was the first building entirely supported by a steel frame, so is considered the first skyscraper. It had 10 stories and rose to a height of 138 feet (42m) high. The steel frame liberated the exterior walls from supporting the building, the walls were instead thin curtain walls. The architect was William LeBaron Jenney, an engineer. In fact the building weighed only one-third as much as a stone building would have; city officials were so concerned that they halted construction while they investigated its safety. The Home Insurance Building is an example of the Chicago School in architecture. In 1890, two additional floors were built on top of the original 10-story building. Category:Chicago skyscrapers Category:Former buildings and structures of the United States

1885

1885 is a common year starting on Thursday.

Events

January


- January 4 - The first successful appendectomy is performed by Dr. William W. Grant on Mary Gartside.
- January 20 - L.A. Thompson patents the roller coaster.
- January 26 - Troops loyal to the Mahdi conquer Khartoum

February


- February 5 - King Léopold II of Belgium establishes the Congo Free State as a personal possession.
- February 9 - The first Japanese arrive in Hawaii.
- February 18 - Mark Twain's Adventures of Huckleberry Finn is published for the first time.
- February 21 - US president Chester A. Arthur dedicates the Washington Monument
- February 23 - British executioner fails to hang John Lee, sentenced of the murder of Emma Keyse. Sentence is commuted to life imprisonment
- February 26 - Final Act of the Berlin Conference regulates European colonisation and trade in Africa.

March


- March-May - North-West Rebellion took place and was put down in Canada.
- March 3 - A subsidiary of the American Bell Telephone Company, American Telephone and Telegraph (AT&T), is incorporated in New York.
- March 4 - Grover Cleveland replaces Chester A. Arthur as President of the United States.
- March 14 - W.S. Gilbert and Arthur Sullivan's The Mikado opens at the Savoy Theatre.
- March 26 - The Times reports that "A lady well-known in literary and scientific circles" has been cremated by the Cremation Society in Woking, Surrey. Jeannette C. Pickersgill was the first person to be officially cremated in the United Kingdom
- March 30 - Pandjeh Incident - Russian force routs Afghan troops and drive them across the Pul-iKhishti bridge
- March 31 - The United Kingdom establishes a protectorate over Bechuanaland.

May


- May 2
  - Good Housekeeping magazine goes on sale for the first time.
  - Cree and Assiniboine warriors won the Battle of Cut Knife, their largest victory over Canadian forces during the North-West Rebellion.
  - The Congo Free State is established by King Léopold II of Belgium.
- May 9-12 - Canadian government forces inflict decisive defeat on Métis rebels at the Battle of Batoche.

June


- June 17 - The Statue of Liberty arrives in New York Harbor.
- June 24 - Randolph Churchill becomes Secretary of State for India

July


- July 6 - Louis Pasteur successfully tests his vaccine against rabies. The patient is Joseph Meister; a boy who was bitten by a rabid dog.
- July 20 - Professional football legalized in Britain

September


- September 2 - In Rock Springs, Wyoming, 150 white miners attack their Chinese coworkers, killing 28, wounding 15, and forcing several hundred more out of town.
- September 6 - Eastern Rumelia declares its union with Bulgaria. The Unification of Bulgaria is accomplished.
- September 18 - Union of Eastern Rumelia with Bulgaria proclaimed at Plovdiv.
- September 30 - A British force abolishes the Boer republic of Stellaland and adds it to British Bechuanaland.

November


- November 7 - Canadian Pacific Railway finished: In Craigellachie, British Columbia, construction ends on a railway extending across Canada. Prime Minister John A. Macdonald considered the project to be vital to Canada.
- November 11 - George S. Patton, Jr. Born in San Gabriel, California.
- November 14-28 - Serbo-Bulgarian War: Serbia declares war against Bulgaria but is defeated in Battle of Slivnitsa on November 17-19.
- November 16 - Canadian rebel leader of the Métis, Louis Riel is executed for high treason.

December


- December 1 - The US Patent Office acknowledges this date as the day Dr Pepper was served for the very first time; the exact date of Dr Pepper's invention is unknown.
- December 28 - 72 Indian lawyers, academicians and journalists gather in Bombay to form the Congress Party

Unknown Dates


- Creation of the first genuine bicycle, the Rover, by John K Starley.
- John Boyd Dunlop invents the pneumatic tire.
- Cholera epidemic in Spain – one of the victims is the king Alfonso XII
- Third Burmese War begins
- Sitting Bull joins Buffalo Bill
- Nikola Tesla sells a number of his patents to George Westinghouse
- William Stanley, Jr. builds the first practical alternating current transformer device, the induction coil.
- Local anesthetic
- First skyscraper – Home Insurance Building in Chicago, Illinois, USA (10 floors)
- Bicycle Playing Cards first produced

Births


- January 6 - Florence Turner, American actress (d. 1946)
- January 8 - John Curtin, Prime Minister of Australia (d. 1945)
- January 11 - Alice Paul, American women's rights activist (d. 1977)
- January 21 - Umberto Nobile, Italian politician and airship designer (d. 1978)
- January 27 - Jerome Kern, American composer (d. 1945)
- January 27 - Eduard Künnecke, German composer (d. 1953)
- January 29 - Leadbelly, American musician (d. 1949)
- February 7 - Sinclair Lewis, American writer, Nobel Prize laureate (d. 1951)
- February 9 - Alban Berg, Austrian composer (d. 1935)
- February 13 - Bess Truman, First Lady of the United States (d. 1982)
- February 15 - Princess Alice of Battenberg (d. 1969)
- February 21 - Sacha Guitry, Russian-born dramatist, writer, director, and actor (d. 1957)
- February 24 - Chester Nimitz, U.S. admiral (d. 1966)
- February 24 - Stanisław Ignacy Witkiewicz, Polish writer and painter (d. 1939)
- March 6 - Ring Lardner, American writer (d. 1933)
- March 11 - Sir Malcolm Campbell, English land and water racer (d. 1948)
- March 14 - Raoul Lufbery, World War I American pilot (d. 1918)
- March 31 - Pascin, Bulgarian painter (d. 1930)
- April 1 - Wallace Beery, American actor (d. 1949)
- April 3 - Allan Dwan, Canadian-born film director (d. 1981)
- April 4 - Arthur Murray, American dancer (d. 1991)
- May 2 - Hedda Hopper, American columnist (d. 1966)
- May 7 - George 'Gabby' Hayes, American actor (d. 1969)
- May 14 - Otto Klemperer, German conductor (d. 1973)
- May 21 - Oscar A.C. Lund, Swedish film actor, director, and writer (d. 1963)
- May 22 - Toyoda Soemu, Japanese admiral (d. 1957)
- June 9 - John Edensor Littlewood, British mathematician (d. 1977)
- June 14 - E. L. Grant Watson, writer, anthropologist, and biologist (d. 1970)
- June 22 - Milan Vidmar, Slovenian electrical engineer and chess player (d. 1962)
- July 4 - Louis B. Mayer, American film producer (d. 1957)
- July 14 - King Sisavang Vong, King of Laos (d. 1959)
- July 28 - Monte Attell, American boxer (d. 1960)
- August 1 - George de Hevesy, Hungarian chemist, Nobel Prize laureate (d. 1966)
- September 11 - D.H. Lawrence, English author (d. 1930)
- September 22 - Ben Chifley, Prime Minister of Australia (d. 1951)
- October 3 - Sophie Treadwell, American playwright and journalist

Illinois

Illinois (pronounced or "ill-i-NOY") was the 21st state to join the United States, located in the former Northwest Territory. Its name was given by the state's French explorers after the indigenous Illiniwek people, a consortium of Algonquin tribes that thrived in the area. The word Illiniwek means simply "the people." The capital of Illinois is Springfield, while its largest city is Chicago. The U.S. postal abbreviation for the state is IL. The USS Illinois was named in honor of this state.

History

Pre-Columbian

Cahokia, the urban center of the pre-Columbian Mississippian culture, was located near present-day Collinsville, Illinois. That civilization vanished circa 1400–1500 for unknown reasons. The next major power in the region was the Illiniwek Confederation, a political alliance among several tribes. The Illiniwek gave Illinois its name. The Illini suffered in the seventeenth century as Iroquois expansion forced them to compete with several tribes for land. The Illini were replaced in Illinois by the Potawatomi, Miami, Sauk, and other tribes.

European exploration

French explorers Jacques Marquette, S.J., and Louis Joliet explored the Illinois River in 1673. As a result of their exploration, Illinois was part of the French empire until 1763, when it passed to the British. George Rogers Clark claimed the Illinois Country for the Commonwealth of Virginia during his military campaigns there in 1778. The area was ceded to the new United States in 1783 and became part of the Northwest Territory.

The 1800s

The Illinois-Wabash Company was an early claimant to much of Illinois. The Illinois Territory was created on February 3, 1809. In 1818, Illinois became the 21st U.S. state. Early U.S. settlement began in the south part of the state and quickly spread northward, driving out the native residents. With the 1832 Black Hawk War, the last native tribes were driven out of northern Illinois. The winter of 1830-1831 is called the "Winter of the Deep Snow". A sudden, deep snowfall blanketed the State, making travel impossible for the rest of the winter. Travelers lucky enough to find shelter had to stay where they were. Many others perished. Several severe winters followed, including the "Winter of the Sudden Freeze". On December 20, 1836, a fast-moving cold front passed through, freezing puddles in minutes, killing many travelers who could not reach shelter. The adverse weather resulted in crop failures in the northern part of the State. The resulting exodus toward the southern part of the State contributed to its name: "Egypt". As early as 1840, Illinois was called the "Sucker State". There are at least three stories behind this name. The first is that, because much of the early population of the State bought land, site unseen, from East Coast land speculators, the population was a bunch of "suckers". One problem with this version is whether the term "sucker" had this meaning as early as 1840. The second story is that, in order to survive on the prairie, early settlers had to obtain water by sucking it through a hollow reed out of a crawdad hole. This also seems unlikely. For one thing, there is no documentation that people actually engaged in this disgusting practice. The early settlers avoided the prairie, and settled along creeks. Moreover, water was plentiful on the Prairie. A third version of the "Sucker Story" is that some of the earliest American settlers worked the mines in Galena, Illinois, on the Mississippi River, in the far northwest corner of the State. At first mining was a seasonal occupation, the miners traveling north on the River in the Spring, and returning in the Fall. The migration of the miners corresponded with the seasonal migration of "suckers", a type of fish. The problem with this version is that the fish today known as a "sucker" does not make this migration. Furthermore, nobody has identified any other fish that made such a migration. Illinois is known as the "Land of Lincoln" because it is here that the 16th President spent most of his life, practicing law and living in Springfield. Chicago gained prominence as a canal port after 1848, and as a rail hub soon afterward. By 1857, Chicago was Illinois' largest city.

The Civil War

During the Civil War, over 250,000 Illinois men served in the Union Army, more than any other northern state except New York, Pennsylvania and Ohio. Beginning with President Lincoln's first call for troops and continuing throughout the war, Illinois mustered 150 infantry regiments, which were numbered from the 7th IL to the 156th IL. Seventeen cavalry regiments were also gathered, as well as two light artillery regiments.

Government

1848 introduced in 2001.]] The state government of Illinois is modeled after the federal government with adaptations originating from traditions cultivated during the state's frontier era. As codified in the state constitution, there are three branches of government: executive, legislative and judicial. The executive branch is led by the Governor of Illinois. Legislative functions are given to the Illinois General Assembly, composed of the 118-member Illinois State House of Representatives and the 59-member Illinois State Senate. The judiciary is comprised of the state supreme court, which oversees the lower appellate courts and circuit courts.
- The Governor of Illinois is Rod Blagojevich (Democrat)
- The Lieutenant Governor of Illinois is Pat Quinn (Democrat)
- The Attorney General of Illinois is Lisa Madigan (Democrat)
- The Secretary of State of Illinois is Jesse White (Democrat)
- The Comptroller of Illinois is Daniel Hynes (Democrat)
- The Treasurer of Illinois is Judy Baar Topinka (Republican)
- The Senior United States Senator is Richard J. Durbin (Democrat)
- The Junior United States Senator is Barack Obama (Democrat) As the birthplace of the Republican Party, the GOP was long dominant in Illinois. This has changed and the state has supported Democratic presidential candidates in the last four elections. John Kerry easily won the state's 21 electoral votes in 2004 by a margin of 11 percentage points with 54.8% of the vote. It is the most liberal of the Midwestern states. Traditionally Chicago, East Saint Louis, and the Quad Cities tend to vote heavily Democratic, along with the Central Illinois population centers of Peoria, Champaign-Urbana, Springfield and Decatur. Rural districts tend to vote more heavily Republican, but some, particularly in the southern part of the state, have voted Democratic as well. It should also be noted that the suburban areas surrounding Chicago vote heavily Republican, although this trend has started to go the other direction in the past 10 years.

Geography

Illinois is in the north-central U.S. and borders on Lake Michigan. Surrounding states are Wisconsin to the north, Iowa and Missouri to the west, Kentucky to the south, and Indiana to the east. Illinois also borders Michigan, but only via a water boundary in Lake Michigan. Illinois has three major geographical divisions. The first is Chicagoland, including the city of Chicago, its suburbs, and the adjoining exurban area into which the metropolis is expanding. This region includes a few counties in Indiana and Wisconsin and stretches across much of northern Illinois toward the Iowa border, generally along Interstates 80 and 90. This region is cosmopolitan, densely populated, industrialized, and settled by a variety of ethnic groups. Southward and westward, the second major division is central Illinois, an area of mostly flat prairie. Known as the Land of Lincoln or the Heart of Illinois, it is characterized by small towns and mid-sized cities. Agriculture, particularly corn and soybeans, figures prominently. Major cities include famously average Peoria, Springfield (the state capital), and Champaign-Urbana (home of the University of Illinois). The third division is southern Illinois, comprising the area south of U.S. Route 50, and including Egypt (sometimes erroneously called Little Egypt), near the juncture of the Mississippi River and Ohio River. This region can be distinguished from the other two by its warmer climate, different mix of crops (including some cotton farming in the past), more rugged topography (unglaciated and older, Illinoian Age, glaciated), as well as small-scale oil deposits and coal mining. The area is a little more populated than the central part of the state with the population centered in two areas: the Greater St. Louis Metropolitan Area (the Illinois suburbs of St. Louis are known as "The Metro-East") and the Carbondale, Marion, West Frankfort, Herrin, Murphysboro, Carterville, Johnston City area which is home to a little over 180,000 residents. Collectively, all of Illinois outside the Chicago Metropolitan area is called "downstate Illinois" (even though a portion is slighter north of Chicago) McLean County is the largest county in terms of land area, at 1,184 sq mi., while Cook County is the largest county in terms of population, at 5,327,777 (both figures are as of 2004). In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level. The floodplain on the Mississippi River from Alton to the Kaskaskia River is the American Bottom, and is the site of the ancient city of Cahokia, and was a region of early French settlement, as well as the site of the first state capital, at Kaskaskia.

Economy

Kaskaskia The 2004 total gross state product for Illinois was $528 billion, placing it 5th in the nation. The 2003 per capita income was $32,965. Illinois' agricultural outputs are corn, soybeans, hogs, cattle, dairy products, and wheat. Its industrial outputs are machinery, food processing, electrical equipment, chemical products, publishing, fabricated metal products, transportation equipment, petroleum and coal.

Demographics

According to the U.S. Census Bureau, as of 2004 the population of Illinois was 12,713,634. This includes 1,682,900 foreign-born (13.3%). At the northern edge of the state on Lake Michigan lies Chicago, the nation's third largest city. In 2000, 23.3% of the population lived in the city of Chicago, 43.3% in Cook County and 65.6% in Illinois's part of Chicagoland, the leading industrial and transportation center in the region, which includes Will, DuPage, and Lake Counties as well as Cook County. The rest of the population lives in the smaller cities and in the rural areas that dot the state's plains. The racial makeup of the state is as follows:
- 67.8% White
- 15.1% Black
- 12.3% Hispanic
- 3.4% Asian
- 0.2% Native American
- 1.9% Mixed Race The top five ancestry groups in Illinois are: German (19.6%), African American (15.1%), Irish (12.2%), Mexican (9.2%), Polish (7.5%), and Filipino (1.2%) . Nearly three in ten whites in Illinois claimed at least partial German ancestry on the Census, making the Germans the largest ancestry group in the state. Blacks are present in large numbers in the city of Chicago, East St. Louis, and the southern tip of the state. Residents of American and British ancestry are especially concentrated in the southeastern part of the state. Metropolitan Chicago has the greatest numbers of people of Irish, Mexican, and Polish ancestry. 7.1% of Illinois' population were reported as under 5, 26.1% under 18, and 12.1% were 65 or older. Females made up approximately 51% of the population.

Religion

Protestants are the largest religious group in Illinois, however unlike the other Midwestern states, Illinois is not overwhelmingly Protestant (less than half of the people identify themselves as Protestants). Roman Catholics, who are heavily concentrated in and around Chicago, account for 30% of the population. The religious affiliations of the people of Illinois are:
- Christian – 80%
  - Protestant – 49%
    - Baptist – 12%
    - Lutheran – 7%
    - Methodist – 7%
    - Presbyterian – 3%
    - Other Protestant or general Protestant – 20%
  - Roman Catholic – 30%
  - Other Christian – 1%
- Other Religions – 4%
- Non-Religious – 16%

Important cities and towns

Roman Catholic Roman Catholic

Counties of Illinois

Education

Illinois State Board of Education

The Illinois State Board of Education or ISBE, autonomous of the governor and the state legislature, administers public education in the state. Local municipalities and their respective school districts operate individual public schools but the ISBE audits performance of public schools with an annual school report card. The ISBE also makes recommendations to state leaders concerning education spending and policies. There is current debate as to the role of the ISBE and whether or not its autonomous relationship with the governor and the state legislature is appropriate. In 2002, the Office of the Governor proposed the creation of a monolithic statewide department of education to replace the ISBE. However, direct control of the new department would fall under the state governor's jurisdiction. The structure would mimic the system employed by the Hawaii State Department of Education, which has no local school districts. Opponents to the proposal argue that local communities would lose control over what their children would learn in public schools and the means by which those public schools operate.

Primary and secondary schools

Education is compulsory from kindergarten through the twelfth grade in Illinois, commonly but not exclusively divided into three tiers of primary and secondary education: elementary school, middle school or junior high school and high school. District territories are often complex in structure. In some cases, elementary, middle and junior high schools of a single district feed into high schools in another district.

Colleges and universities

While many students enter the military or join the workforce directly from high school, students have the option of applying to colleges and universities in Illinois. Notable Illinois institutions of higher education include Loyola University Chicago, Northwestern University, University of Chicago and the several branches of the University of Illinois. Illinois is also home to 49 colleges in the Illinois community college system.

List of colleges and universities

Professional sports teams

Favorite sons


- Abraham Lincoln, the 16th President, is buried in Springfield, Illinois
- Adlai Stevenson II, governor, Presidential candidate, United Nations ambassador, is buried in Bloomington, Illinois
- Ronald Reagan, the 40th President, was born in Tampico, Illinois.

Rogues gallery


- William Stratton, Governor, charged with tax evasion, acquitted
- Orville Hodge, State Auditor, imprisoned for embezzlement
- Otto Kerner, Governor, federal judge, imprisoned for bribery.
- Paul Powell, Secretary of State, died with shoeboxes full of money (but never indicted)
- Daniel Walker, Governor, imprisoned for financial fraud
- Dan Rostenkowski, U.S. Congressman, imprisoned for mail fraud
- George Ryan, Secretary of State, Governor, on trial (2005) for corruption

State symbols

George Ryan
- State animal: White-tailed deer (Odocoileus virginianus)
- State bird: Cardinal (Cardinalis cardinalis)
- State capital: Springfield
- State dance: Square dance
- State fish: Bluegill (Lepomis macrochirus)
- State flower: Purple violet (Viola sororia)
- State fossil: Tully Monster (Tullimonstrum gregarium)
- State insect: Monarch butterfly
- State mineral: Fluorite
- State motto: "State sovereignty, national union"
- State prairie grass: Big Bluestem (Andropogon gerardii)
- State slogan: "Land of Lincoln"
- State snack: Popcorn
- State soil: Drummer Silty Clay Loam
- State song: "Illinois"
- State tree: White oak (Quercus alba)

See also


- Little Egypt
- Fort Sheridan, Illinois
- List of ZIP Codes in Illinois
- U.S. presidential election, 2004, in Illinois

External links


- [http://www.illinois.gov State of Illinois Web Site] :
- [http://www.illinois.gov/facts/symbols.cfm Illinois State Symbols]
- [http://www.HavenWorks.com/illinois Illinois News]
- [http://quickfacts.census.gov/qfd/states/17000.html U.S. Census Bureau]
- [http://www.illinoisdata.com/index.htm Illinois Data ]
- [http://www.genealogybuff.com/il/ GenealogyBuff.com - Illinois Library Data Files]
- [http://obit.obitlinkspage.com/il.htm Illinois Obituary Links]
- [http://www.usnewspapers.org/state/illinois Illinois Newspapers]
- [http://dir.webring.com/rw?d=Regional/U_S__States/Illinois Category at Webring]
- [http://www.countymapsofillinois.com/ County Maps of Illinois] Full color maps. List of cities, towns and county seats
- [http://www.rootsweb.com/~ilcumber/ilctybnd/index.htm/ Illinois County Boundaries 1790 to Present]

Scholarly Secondary Sources


- Adams, Jane. The Transformation of Rural Life: Southern Illinois, 1890-1990 (1994) [http://www.questia.com/PM.qst?a=o&d=94852725 online at Questia]
- Biles, Roger. Illinois: A History Of The Land And Its People (2005).
- Buck, Solon J. Illinois in 1818 (1917)
- Cole, Arthur Charles. The Era of the Civil War, 1848-1870 (1919)
- Davis, James E. Frontier Illinois (1998).
- Gove, Samuel K. and James D. Nowlan. Illinois Politics & Government: The Expanding Metropolitan Frontier (1996) [http://www.questia.com/PM.qst?a=o&d=79398589 online at Questia]
- Hallwas, John E. ed., Illinois Literature: The Nineteenth Century (1986)
- Hicken, Victor. Illinois in the Civil War (1966).
- Hoffmann, John. A Guide to the History of Illinois. (1991), highly detailed annotated bibliography. [http://www.questia.com/PM.qst?a=o&d=71151873 online at Questia]
- Horsley, A. Doyne. Illinois: A Geography (1986)
- Howard, Robert P. Illinois: A History of the Prairie State (1972).
- Jensen, Richard. Illinois: A History (2001).
- Keiser, John H. Building for the Centuries: Illinois 1865-1898 (1977)
- Meyer, Douglas K. Making the Heartland Quilt: A Geographical History of Settlement and Migration in Early-Nineteenth-Century Illinois (2000) [http://www.questia.com/PM.qst?a=o&d=65659204 online at Questia]
- Pease, Theodore Calvin. The Frontier State, 1818-1848 (1918).
- Peck, J. M. A Gazetteer of Illinois (1837), [http://history.alliancelibrarysystem.com/IllinoisAlive/files/bp/htm7/bp000182.cfm a primary source online]
- Sutton, Robert P. ed. The Prairie State: A Documentary History of Illinois (1977).
- WPA. Illinois: A Descriptive and Historical Guide (1939) [http://www.questia.com/PM.qst?a=o&d=59301214 online at Questia]

Popular Accounts

Tails and Trails of Illinois, Stu Fliege, University of Illinois Press, 2002.
- Category:States of the United States ko:일리노이 주 ja:イリノイ州 th:มลรัฐอิลลินอยส์

1931

1931 (MCMXXXI) is a common year starting on Thursday.

Events

January-March


- January 4 - Elly Beinhorn begins her flight to Africa
- January 6 - Thomas Edison submits his last patent application.
- January 22 - Sir Isaac Isaacs sworn in as the first Australian-born Governor-General of Australia
- January 25 - Mohandas Gandhi released again
- January 27 - Pierre Laval forms a government in France
- February 10 - New Delhi becomes the capital of India
- February 16 - Pehr Evind Svinhufvud elected president of Finland
- February 20 - California gets the go-ahead by the U.S. Congress to build the San Francisco-Oakland Bay Bridge.
- February 21 - Peruvian revolutionaries hijack a Ford Tri-motor aeroplane and demand that the pilot drop propaganda leaflets over Lima
- March 1 - Henry Pu Yi, former Emperor of China, is proclaimed King of the puppet state of Manchukuo by Japan.
- March 1 - USS Arizona (BB-39) placed back in full commission after a refit
- March 3 - The Star-Spangled Banner is adopted as the United States National anthem.
- March 4 - British viceroy of India and Mohandas Gandhi negotiate
- March 7 - New House of Representatives opened in Helsinki, Finland
- March 17 - Nevada legalizes gambling
- March 25 - The Scottsboro Boys are arrested in Alabama and charged with rape.
- March 27 - British writer Arnold Bennet dies in Paris when he drinks local water to prove it safe to drink - but is poisoned
- March 31 - An earthquake destroys Managua, Nicaragua killing 2,000.

April-August


- April 1 - Earthquake destroys Managua, Nicaragua - over 2000 dead
- April 6 - Portuguese government declares martial law in Madeira and in the Azores because of an attempted military takeover in Funchal
- April 9 - Execution of Argentinean anarchist Severino Digiovanni
- April 14 - 2nd Spanish Republic proclaimed in Spain
- April 22 - Austria, Britain, Denmark, Germany, Italy, Sweden and USA recognize the Spanish Republic
- May 1 - Construction of the Empire State Building is completed in New York City
- May 4 - Kemal Atatürk re-elected president of Turkey
- May 13 - Paul Doumer elected president of France
- June 12 - Charlie Parker equals J.T. Hearne's record for the earliest date to reach 100 wickets.
- June 14 - Yacht St Philiebert sinks in river Loire in France - over 500 drown
- June 23 - Wiley Post and Harold Gatty take off from Roosevelt Field, Long Island in an attempt to accomplish the first round-the-world flight in a single-engine plane. [http://www.centennialofflight.gov/essay/Explorers_Record_Setters_and_Daredevils/Wiley_Post/EX27.htm]
- July 1 - Official opening of Milan Central Station
- July 16 - Emperor Haile Selassie of Ethiopia signs the first constitution of Ethiopia
- Huang He floods kill between 850,000 and 4,000,000 people - the most deadly historic natural disaster.
- August 24 - Labour Government of Ramsay MacDonald resigns in Britain - replaced by National Government of people drawn from all parties also under MacDonald.
- August 31 - Yangtze River floods - 23 million made homeless

September-December


- September 5 - John Thomson, soccer player, dies in an accident during a Celtic - Rangers match
- September 15 - The Invergordon Mutiny: Strikes in Royal Navy due to decreased salaries
- September 18 - Mukden Incident. After that, Japan uses it to occupy Manchuria.
- September 18 - Geli Raubal is found shot dead in Hitler's apartment
- November 7 - Chinese People's Republic proclaimed by Mao Tse Tung.
- November 8 - French gendarmes launch a large scale raid against Corsican bandits
- November 8 - Panama Canal closed for couple of weeks due to damage caused by a number of earthquakes
- December 10 - Niceto Alcalá-Zamora elected president of Spanish republic

Undated


- Deuterium discovered by Harold Clayton Urey.
- The Castellemmarese War ends with the assassination of Joe "The Boss" Masseria, briefly leaving Salvatore Maranzano as capo di tutti capi, "boss of all bosses" and undisputed ruler of the American mafia. Maranzano is himself assassinated less than 6 months later, leading to the establishment of the Five Families
- Ust-Abakanskoye becomes Abakan.
- National Committee for Modification of the Volstead Act formed to work for repeal of prohibition in United States.

Births

January


- January 5 - Alvin Ailey, American choreographer (d. 1989)
- January 5 - Alfred Brendel, Austrian pianist
- January 5 - Robert Duvall, American actor and director
- January 6 - E. L. Doctorow, American author
- January 8 - Bill Graham, German concert promoter (d. 1991)
- January 10 - Peter Barnes, English playwright and screenwriter (d. 2004)
- January 13 - Charles Nelson Reilly, American actor
- January 14 - Caterina Valente, French singer and actress
- January 16 - Johannes Rau, President of Germany
- January 17 - James Earl Jones, American actor
- January 19 - Tippi Hedren, American actress
- January 19 - Robert MacNeil, Canadian journalist
- January 20 - David Lee, American physicist, Nobe Prize laureate
- January 22 - Sam Cooke, American singer (d. 1964)
- January 27 - Mordecai Richler, Canadian author (d. 2001)
- January 30 - Allan W. Eckert, American historian, naturalist, and author
- January 31 - Ernie Banks, baseball player

February-April


- February 1 - Boris Yeltsin, President of Russia
- February 2 - Dries van Agt, Dutch politician
- February 6 - Rip Torn, American actor and director
- February 8 - James Dean, American actor (d. 1955)
- February 10 - Thomas Bernhard, Dutch author (d. 1989)
- February 11 - Larry Merchant, author and boxing commentator
- February 18 - Johnny Hart, American cartoonist
- February 18 - Toni Morrison, American writer, Nobel Prize laureate
- February 18 - Bob St. Clair, American football star
- February 24 - Brian Close, British cricket player
- February 26 - Ally McLeod, Scottish football manager
- February 28 - Dean Smith, American basketball coach
- March 2 - Mikhail Gorbachev, President of the Soviet Union, recipient of the Nobel Peace Prize
- March 2 - Tom Wolfe, American author
- March 11 - Rupert Murdoch, Australian-born publisher
- March 22 - Burton Richter, American physicist, Nobel Prize laureate
- March 22 - William Shatner, Canadian actor
- March 26 - Leonard Nimoy, American actor and director
- March 29 - Aleksei Gubarev, cosmonaut
- April 1 - Rolf Hochhuth, German writer
- April 27 - Igor Oistrakh, Ukrainian violinist
- April 29 - Frank Auerbach, German-born painter
- April 29 - Lonnie Donegan, Scottish musician (d. 2002)

May-August


- May 6 - Willie Mays, baseball player
- May 7 - Teresa Brewer, American singer
- May 13 - Jim Jones, American cult leader (d. 1978)
- May 14 - Alvin Lucier, American composer
- May 15 - Ken Venturi, American golfer
- May 16 - Natwar Singh, Indian politician
- May 18 - Robert Morse, American actor
- May 19 - Eric Tappy, Swiss tenor
- May 20 - Ken Boyer, baseball player (d. 1982)
- May 25 - Georgi Grechko, cosmonaut
- May 31 - John Robert Schrieffer, American physicist, Nobel Prize laureate
- May 31 - Shirley Verrett, American mezzo-soprano
- June 3 - Lindy Remigino, American athlete
- June 7 - Malcolm Morley, English-born painter
- June 9 - Joe Santos, American actor
- June 20 - Martin Landau, American actor
- June 27 - Martinus J. G. Veltman, Dutch physicist, Nobel Prize laureate
- July 1 - Leslie Caron, French actress
- July 10 - Alice Munro, Canadian writer
- July 26 - Fred Foster, American songwriter and record producer
- August 12 - William Goldman, American author
- August 19 - Willie Shoemaker, American jockey (d. 2003)
- August 23 - Hamilton O. Smith, American microbiologist, recipient of the Nobel Prize in Physiology or Medicine
- August 25 - Regis Philbin, American television personality
- August 28 - John Shirley-Quirk, English bass-baritone
- August 31 - Jean Béliveau, Canadian hockey player

September-December


- September 17 - Anne Bancroft, American actress (d. 2005)
- September 22 - Fay Weldon, British author
- September 22 - George Younger, 4th Viscount Younger of Leckie, British politician (d. 2003)
- September 23 - Gerald Stairs Merrithew, Canadian educator and statesman (d. 2004)
- September 29 - James Watson Cronin, American nuclear physicist, Nobel Prize laureate
- September 29 - Anita Ekberg, Swedish actress
- September 30 - Wesley L. Fox, U.S. Marine Corps officer
- October 6 - Riccardo Giacconi, Italian-born physicist, Nobel Prize laureate
- October 7 - Cotton Fitzsimmons, American basketball coach (d. 2004)
- October 7 - Desmond Tutu, South African Anglican archbishop and activist, recipient of the Nobel Peace Prize
- October 13 - Eddie Mathews, baseball player (d. 2001)
- October 20 - Mickey Mantle, baseball player (d. 1995)
- October 23 - Jim Bunning, baseball player and U.S. Senator
- October 23 - Diana Dors, English actress
- November 15 - Mwai Kibaki, Kenya's third president
- November 21 - Malcolm Williamson, Australian composer (d. 2003)
- November 23 - Dervla Murphy, Irish author
- November 26 - Adolfo Pérez Esquivel, Argentine activist, recipient of the Nobel Peace Prize
- November 28 - Hope Lange, American actress (d. 2003)
- December 23 - Ronnie Schell, American actor
- December 24 - Mauricio Kagel, Argentine composer
- December 30 - Skeeter Davis, Ameircan singer (d. 2004)
- December 31 - Bob Shaw, British author (d. 1996)

Month/day unknown


- Joseph A. Califano, Jr., American politician

Deaths


- January 14 - Hardy Richardson, baseball player (b. 1855)
- January 23 - Anna Pavlova, Russian ballerina (b. 1881)
- February 11 - Charles Algernon Parsons, British inventor (b. 1854)
- February 16 - Wilhelm von Gloeden, German photographer (b. 1856)
- February 26 - Otto Wallach, German chemist, Nobel Prize laureate (b. 1847)
- March 7 - Akseli Gallén-Kallela, Finnish painter (b. 1865)
- March 11 - F.W. Murnau, German director (b. 1888)
- March 21 - Bhagat Singh, Indian revolutionary (b. 1908)
- March 31 - Knute Rockne, American football coach (b. 1888)
- April 8 - Erik Axel Karlfeldt, Swedish writer, Nobel Prize laureate (b. 1864)
- April 10 - Khalil Gibran Lebanese poet and painter (b. 1883)
- April 30 - Sammy Woods, English cricketer (b. 1867)
- May 9 - Albert Abraham Michelson, German-born physicist, Nobel Prize laureate (b. 1852)
- May 14 - David Belasco, American writer (b. 1853)
- July 4 - Buddie Petit, American jazz musician
- July 12 - Nathan Söderblom, Swedish archbishop, recipient of the Nobel Peace Prize (b. 1866)
- August 6 - Bix Beiderbecke, American jazz trumpeter (b. 1903)
- August 27 - Frank Harris, Irish author and editor (b. 1856)
- August 27 - Francis Marion Smith, American borax magnate (b. 1846)
- October 13 - Ernst Didring, Swedish writer (b. 1868)
- October 18 - Thomas Edison, American inventor (b. 1847)
- November 11 - Shibusawa Eiichi, Japanese industrialist (b. 1840)
- December 2 - Vincent d'Indy, French composer (b. 1851)

Undated


- Joseph Tabrar, British songwriter (b. 1857)

Nobel Prizes


- Physics - not awarded
- Chemistry - Carl Bosch, Friedrich Bergius
- Medicine - Otto Heinrich Warburg
- Literature - Erik Axel Karlfeldt
- Peace - Jane Addams, Nicholas Murray Butler Category:1931 ko:1931년 ms:1931 ja:1931年 simple:1931 th:พ.ศ. 2474

Steel

Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. Carbon acts as a hardening agent, preventing iron atoms, which are naturally arranged in a lattice, from sliding past one another. Varying the amount of carbon and its distribution in the alloy controls qualities such as the hardness, elasticity, ductility, and tensile strength of the resulting steel. Steel with increased carbon content can be made harder and stronger than iron, but is also more brittle. One classical definition is that steels are iron–carbon alloys with up to 1.5 percent carbon by weight; alloys with higher carbon content than this are known as cast iron. Currently there are several classes of steels in which carbon is replaced with other alloying materials, and carbon, if present, is undesired. A more recent definition is that steels are iron-based alloys that can be plastically formed (pounded, rolled, etc.).

Iron and steel

plastically Iron, like most metals, is not found in the Earth's crust in a native state. Iron can be found in the crust only in combination with oxygen or sulfur. Typically Fe2O3—the form of iron oxide found as the mineral hematite, and FeS2—Pyrite. Iron oxide is a soft sandstone-like material with limited uses on its own. Iron is extracted from ore by removing the oxygen by combining it with a preferred chemical partner such as carbon. This process, known as smelting, was first applied to metals with lower melting points. Copper melts at just over 1000 °C, while tin melts around 250 °C. Both temperatures could be reached with ancient methods that have been used for at least 6000 years (since the Bronze Age). Since the oxidation rate itself increases rapidly beyond 800 °C, it is important that smelting take place in a fairly oxygen-free environment. Unlike copper and tin, liquid iron dissolves carbon quite readily, so that smelting results in an alloy containing too much carbon to be called steel. Bronze Age Even in the narrow range of concentrations that make up steel, mixtures of carbon and iron can form into a number of different structures, or allotropes, with very different properties; understanding these is essential to making quality steel. At room temperature, the most stable form of iron is the body-centered cubic structure ferrite or α-iron, a fairly soft metallic material that can dissolve only a small concentration of carbon (no more than 0.021 wt% at 910 °C). Above 910 °C ferrite undergoes a phase transition from body-centered cubic to a face-centered cubic configuration, called austenite or γ-iron, which is similarly soft and metallic but can dissolve considerably more carbon (as much as 2.04 wt% carbon at 1146 °C). As carbon-rich austenite cools, the mixture attempts to revert to the ferrite phase, resulting in an excess of carbon. One way for carbon to leave the austenite is for cementite to precipitate out of the mix, leaving behind iron that is pure enough to take the form of ferrite, and resulting in a cementite-ferrite mixture. Cementite is a stochiometric phase with the chemical formula of Fe3C. Cementite forms in regions of higher carbon content while other areas revert to ferrite around it. Self-reinforcing patterns often emerge during this process, leading to a patterned layering known as pearlite due to its pearl-like appearance, or the similar but less beautiful bainite. Perhaps the most important allotrope is martensite, a chemically metastable substance with about four to five times the strength of ferrite. Martensite has a very similar unit cell structure to austenite, and identical chemical composition. As such, it requires extremely little thermal activation energy to form. The heat treatment process for most steels involves heating the alloy until austenite forms, then quenching the hot metal in water or oil, cooling it so rapidly that the transformation to ferrite or perlite does not have time to take place. The transformation into martensite, by contrast, occurs almost immediately, due to a lower activation energy. Martensite has a lower density than austenite, so that the transformation between them results in a change of volume. In this case, expansion occurs. Internal stresses from this expansion generally take the form of compression on the crystals of martensite and tension on the remaining ferrite, with a fair amount of shear on both constituents. If quenching is done improperly, these internal stresses can cause a part to shatter as it cools; at the very least, they cause internal work hardening and other microscopic imperfections. At this point, if its carbon content is high enough to produce a significant concentration of martensite, the metal resembles spring steel: extremely hard, but very brittle. Often, steel undergoes further heat treatment at a lower temperature to destroy some of the martensite (by allowing enough time for cementite, etc., to form) and help settle the internal stresses and defects. This softens the steel, producing a more ductile and fracture-resistant metal. Because time is so critical to the end result, this process is known as tempering, source of the term tempered steel. Other materials are often added to the iron-carbon mixture to tailor the resulting properties. Nickel and manganese in steel add to its tensile strength and make austenite more chemically stable, chromium increases the hardness and melting temperature, and vanadium also increases the hardness while reducing the effects of metal fatigue. Large amounts of chromium and nickel (often 18 and 8 %, respectively) are added to stainless steel so that a hard oxide forms on the metal surface to inhibit corrosion. Tungsten interferes with the formation of cementite, allowing martensite to form with slower quench rates, resulting in high speed steel. On the other hand sulfur, nitrogen, and phosphorus make steel more brittle, so these commonly found elements must be removed from the ore during processing. When iron is smelted from its ore by commercial processes, it contains more carbon than is desirable. To become steel, it must be melted and reprocessed to remove the correct amount of carbon, at which point other elements can be added. Once this liquid is cast into ingots, it usually must be "worked" at high temperature to remove any cracks or poorly mixed regions from the solidification process, and to produce shapes such as plate, sheet, wire, etc. It is then heat-treated to produce a desirable crystal structure, and often "cold worked" to produce the final shape. In modern steelmaking these processes are often combined, with ore going in one end of the assembly line and finished steel coming out the other. These can be streamlined by a deft control of the interaction between work hardening and tempering.

History of iron and steelmaking

Iron was in limited use long before it became possible to smelt it. The first signs of iron use come from Ancient Egypt and Sumer, where around 4000 BC small items, such as the tips of spears and ornaments, were being fashioned from iron recovered from meteorites (see Iron: History). About 6% of meteorites are composed of an iron-nickel alloy, and iron recovered from meteorite falls allowed ancient peoples to manufacture small numbers of iron artifacts. Meteoric iron was also fashioned into tools in precontact North America. Beginning around the year 1000, the Thule people of Greenland began making harpoons and other edged tools from pieces of the Cape York meteorite. These artifacts were also used as trade goods with other Arctic peoples: tools made from the Cape York meteorite have been found in archaeological sites more than 1000 miles (1600 km) away. When the American polar explorer Robert Peary shipped the largest piece of the meteorite to the American Museum of Natural History in New York City in 1897, it still weighed over 33 tons. The name for iron in several ancient languages means "sky metal" or something similar. In distant antiquity, iron was regarded as a precious metal, suitable for royal ornaments.

The Iron Age

ton Beginning between 3000 BC to 2000 BC increasing numbers of smelted iron objects (distinguishable from meteoric iron by their lack of nickel) appear in Anatolia, Egypt and Mesopotamia (see Iron: History). The oldest known samples of iron that appear to have been smelted from iron oxides are small lumps found at copper-smelting sites on the Sinai Peninsula, dated to about 3000 BC. Some iron oxides are effective fluxes for copper smelting; it is possible that small amounts of metallic iron were made as a by-product of copper and bronze production throughout the Bronze Age. In Anatolia, smelted iron was occasionally used for ornamental weapons: an iron-bladed dagger with a bronze hilt has been recovered from a Hattic tomb dating from 2500 BC. Also, the Egyptian ruler Tutankhamun died in 1323 BC and was buried with an iron dagger with a golden hilt. An Ancient Egyptian sword bearing the name of pharaoh Merneptah as well as a battle axe with an iron blade and gold-decorated bronze haft were both found in the excavation of Ugarit (see Ugarit). The early Hittites are known to have bartered iron for silver, at a rate of 40 times the iron's weigh, with Assyria. Iron did not, however, replace bronze as the chief metal used for weapons and tools for several centuries, despite some attempts. Working iron required more fuel and significantly more labor than working bronze, and the quality of iron produced by early smiths may have been inferior to bronze as a material for tools. Then, between 1200 and 1000 BC, iron tools and weapons displaced bronze ones throughout the near east. This process appears to have begun in the Hittite Empire around 1300 BC, or in Cyprus and southern Greece, where iron artifacts dominate the archaeological record after 1050 BC. Mesopotamia was fully into the Iron Age by 900 BC, central Europe by 800 BC. The reason for this sudden adoption of iron remains a topic of debate among archaeologists. One prominent theory is that warfare and mass migrations beginning around 1200 BC disrupted the regional tin trade, forcing a switch from bronze to iron. Egypt, on the other hand, did not experience such a rapid transition from the bronze to iron ages: although Egyptian smiths did produce iron artifacts, bronze remained in widespread use there until after Egypt's conquest by Assyria in 663 BC. Iron smelting at this time was based on the bloomery, a furnace where bellows were used to force air through a pile of iron ore and burning charcoal. The carbon monoxide produced by the charcoal reduced the iron oxides to metallic iron, but the bloomery was not hot enough to melt the iron. Instead, the iron collected in the bottom of the furnace as a spongy mass, or bloom, whose pores were filled with ash and slag. The bloom then had to be reheated to soften the iron and melt the slag, and then repeatedly beaten and folded to force the molten slag out of it. The result of this time-consuming and laborious process was wrought iron, a malleable but fairly soft alloy containing little carbon. Wrought iron can be carburized into a mild steel by holding it in a charcoal fire for prolonged periods of time. By the beginning of the Iron Age, smiths had discovered that iron that was repeatedly reforged produced a higher quality of metal. Quench-hardening was also known by this time. The oldest quench-hardened steel artifact is a knife found on Cyprus at a site dated to 1100 BC.

Developments in China

Archaeologists and historians debate whether bloomery-based ironworking ever spread to China from the West. Around 500 BC, however, metalworkers in the southern state of Wu developed an iron smelting technology that would not be practiced in Europe until late medieval times. In Wu, iron smelters achieved a temperature of 1130°C, hot enough to be considered a blast furnace. At this temperature, iron combines with 4.3% carbon and melts. As a liquid, iron can be cast into molds, a method far less laborious than individually forging each piece of iron from a bloom. Cast iron is rather brittle and unsuitable for striking implements. It can, however, be decarburized to steel or wrought iron by heating it in air for several days. In China, these ironworking methods spread northward, and by 300 BC, iron was the material of choice throughout China for most tools and weapons. A mass grave in Hebei province, dated to the early third century BC, contains several soldiers buried with their weapons and other equipment. The artifacts recovered from this grave are variously made of wrought iron, cast iron, malleabilized cast iron, and quench-hardened steel, with only a few, probably ornamental, bronze weapons. During the Han Dynasty (202 BC–AD 220), Chinese ironworking achieved a scale and sophistication not reached in the West until the eighteenth century. In the first century, the Han government established ironworking as a state monopoly and built a series of large blast furnaces in Henan province, each capable of producing several tons of iron per day. By this time, Chinese metallurgists had discovered how to puddle molten pig iron, stirring it in the open air until it lost its carbon and became wrought iron. (In Chinese, the process was called chao, literally, stir-frying.) Also during this time, Chinese metallurgists had found that wrought iron and cast iron could be melted together to yield an alloy of intermediate carbon content, that is, steel. According to legend, the sword of Liu Bang, the first Han emperor, was made in this fashion. Some texts of the era mention "harmonizing the hard and the soft" in the context of ironworking; the phrase may refer to this process.

India

Perhaps as early as 300 BC, although certainly by AD 200, high quality steel was being produced in southern India by what Europeans would later call the crucible technique. In this system, high-purity wrought iron, charcoal, and glass were mixed in crucibles and heated until the iron melted and absorbed the carbon. The resulting high-carbon steel, called پولاد (pulâd) in Persian and wootz by later Europeans, was exported throughout much of Asia. A solid pillar of rust-resistant steel forged in 4th century AD and now standing for many centuries next to the Kutab Minar in Delhi is a testimony of the steel manufaturing skills of Indian artisans. The famous Damascus sword was made of steel imported from India.

Middle East

By the 9th century, smiths in the Abbasid caliphate had developed techniques for forging wootz to produce steel blades of unusual flexibility and sharpness (Damascus steel). The secret of forging this kind of steel was lost, even in the Middle East, by around 1600, and only recently have metallurgists found methods for reproducing its properties.

Ironworking in medieval Europe

The middle ages in Europe saw the construction of progressively larger bloomeries. By the 8th century, smiths in northern Spain had developed a style that become known as a Catalan forge, a furnace about 1 meter (3 feet) tall, capable of smelting up to 150 kg (350 lb) of iron in each batch. In succeeding centuries, smiths in the Frankish empire and later the Holy Roman Empire scaled up this basic design, increasing the height of the flue to as tall as 5 meters (16 feet) and smelting as much as 350 kg (750 lb) of iron in each batch. These larger furnaces required more draft than could be provided by human power, and forging the large blooms that resulted was also beyond the capabilities of a single man. To this end, waterwheels were employed to power the bellows and hammers. Eventually, the scaling up of the bloomery reached a point where the furnace was hot enough to produce cast iron. Although the brittle cast iron may initially have been a nuisance to the smith, as it was too brittle to be forged, the spread of cannon to Europe in the 1300s provided an application for iron casting, cast iron cannonballs. The oldest known blast furnace in Europe was constructed at Lapphyttan in Sweden, sometime between 1150 and 1350. Other early European blast furnaces were built throughout the Rhine valley: blast furnaces were in operation near Liège (a city in modern-day Belgium) in the 1340s, and at Massevaux in France by 1409. The first English blast furnace was not built until 1496, when Henry VII commissioned a new ironworks at Newbridge, in a part of Sussex known as the Weald. Despite this late start, the production of English iron foundries rapidly grew, in no small part due to foreign craftsmen hired by Henry to bring the craft of iron casting to England. In 1543, William Levett, a Wealden ironmaster, and Peter Baude, a French craftsman in Henry VIII's employ, cast the Weald's first one-piece iron cannon. English iron cannons gained a reputation for being superior to, and less expensive than, the bronze cannons made elsewhere in Europe, and at least initially, efforts to copy them outside the Weald failed. The superiority of English cannons over Spanish ones has been credited as one factor in England's 1588 defeat of the Spanish Armada. In 1619, Jan Andries Moerbeck, a Dutch ironmaster, began importing Wealden iron ore for comparison to the ore available on the Continent. One difference he observed was that the English ore contained some calcareous material, and soon after, Dutch ironmasters introduced the use of limestone as a flux in the blast furnace. This practice improved the separation of slag from the cast iron and improved the quality of Continental cast iron.

Ironworking in early modern Europe

Dutch Also by the early 1600s, ironworkers in western Europe had found a means (called cementation) to carburize wrought iron without individually forging each piece. Wrought iron bars and charcoal were packed into stone boxes, then held at a red heat for up to a week. During this time, carbon diffused into the iron, producing a product called cement steel or blister steel. For many years the best steels could be produced by buying expensive iron ore from Sweden. Although it was not understood at the time, Swedish ore had very low phosphorus content compared to most ores (notably those in England), which allowed for a finer and stronger crystal structure. Sales of Swedish ore generated considerable trade income, and local development helped the country become the industrialised nation it remains to this day. By the 18th century, deforestation in western Europe was making ironworking and its charcoal-hungry processes increasingly expensive. In 1709 Abraham Darby began smelting iron using coke, a refined coal product, in place of charcoal at his ironworks at Coalbrookdale in England. Although coke could be produced less expensively than charcoal, coke-fired iron was initially of inferior quality compared to charcoal-fired iron. It was not until the 1750s, when Darby's son refined the coking process to reduce the amount of sulfur in the coke that coke-fired furnaces became widespread. Another 18th-century European development was the reinvention of the puddling furnace. In particular, the form of coal-fired puddling furnace developed by the British engineer Henry Cort in 1784 made it possible to convert cast iron into wrought iron in large batches, finally rendering the ancient bloomery obsolete. Wrought iron produced using this method became a major metal in the English midlands' emerging toy industry. The combination of the blast furnace and the puddling furnace allowed iron to be produced at either end of the carbon spectrum, depending on the user's needs. As for alloys of intermediate carbon content (that is, steel), crucible steel was rediscovered in the 1740s by Benjamin Huntsman in Handsworth in England. In his process, wrought iron and cast iron were heated in small ceramic crucibles, melting together to form steel. While producing steel superior to cement steel, the crucible steel process remained relatively expensive in both time and fuel, and could not be used in any sort of modern industrial scale. The strong steels produced were however in high demand for specialty products such as cutlery and weapons. Sheffield's Abbeydale Industrial Hamlet has preserved a waterwheel powered, scythe-making works dating from Huntsman's times. It is still operated for the public, several times per year, using crucible steel made on the Abbeydale site.

Industrial steelmaking

Abbeydale Industrial Hamlet The problem of mass-producing steel was solved in 1855 by Henry Bessemer, with the introduction of the Bessemer converter at his steelworks in Sheffield, England. (An early converter can still be seen at the city's Kelham Island Museum). In the Bessemer process, molten pig iron from the blast furnace was charged into a large crucible, and then air was blown through the molten iron from below, igniting the dissolved carbon from the coke. As the carbon burned off, the melting point of the mixture increased, but the heat from the burning carbon provided the extra energy needed to keep the mixture molten. After the carbon content in the melt had dropped to the desired level, the air draft was cut off: a typical Bessemer converter could convert a 25-ton batch of pig iron to steel in half an hour. In 1867, the German-British engineer Sir William Siemens introduced an improved puddling furnace – the regenerative furnace – that used brick heat exchangers to preheat the incoming air and conserve fuel. The next year Pierre and Émile Martin, French ironmasters who had licensed Siemens' furnace design, developed a method for measuring the carbon content of molten iron. Thus, the decarburization could be stopped at the steel stage rather than proceeding all the way to wrought iron. This open-hearth process coexisted in industrial practice with the Bessemer process for many years, but eventually proved more economical and displaced it. Reasons for this include its ability to recycle scrap metal in addition to fresh pig iron, its greater scalability (up to hundreds of tons per batch, compared to tens of tons for the Bessemer process), and the more precise quality control it permitted. quality control Initially, only ores low in phosphorus and sulfur could be used for quality steelmaking; ores rich in those elements yielded brittle metals little better than cast iron. This problem was solved in 1878 by Percy Carlyle Gilchrist and his cousin Sidney Gilchrist Thomas at the ironworks at Blaenavon in Wales. Their modified Bessemer process used a converter lined with limestone or dolomite, and additional lime was added to the molten metal as a flux. This added basic material removed phosphorus and sulfur from the steel as insoluble calcium or magnesium phosphates and sulfates. This development expanded the range of iron ores that could be used to make steel, especially in France and Germany, where high-phosphorus ores abounded. These developments increased the availability and decreased the price of steel; 22 thousand tonnes were produced in 1867, 500 thousand in 1870, 1 million in 1880 and 28 million by 1900. Today, worldwide annual production is around 1.1 billion tonnes. This widespread availability of inexpensive steel powered the industrial revolution and modern society as we know it. It also led to the introduction of newer "niche" steels (such as stainless steel), all of them dependent on the wide availability of inexpensive iron and steel and the ability to alloy it at will.

Types of steel

Alloy steels were known from antiquity, being nickel-rich iron from meteorites hot-worked into useful products. In a modern sense, alloy steels ha