A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder; this pushing force is transformed, into rotational force for work. The term "steam engine" is applied only to reciprocating engines as just described, not to the steam turbine. Steam engines are external combustion engines, where the working fluid is separated from the combustion products; the ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. In general usage, the term steam engine can refer to either complete steam plants such as railway steam locomotives and portable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. Steam-driven devices were known as early as the aeliopile in the first century AD, with a few other uses recorded in the 16th and 17th century. Thomas Savery's dewatering pump used steam pressure operating directly on water.
The first commercially-successful engine that could transmit continuous power to a machine was developed in 1712 by Thomas Newcomen. James Watt made a critical improvement by removing spent steam to a separate vessel for condensation improving the amount of work obtained per unit of fuel consumed. By the 19th century, stationary steam engines powered the factories of the Industrial Revolution. Steam engines replaced sail for ships, steam locomotives operated on the railways. Reciprocating piston type steam engines were the dominant source of power until the early 20th century, when advances in the design of electric motors and internal combustion engines resulted in the replacement of reciprocating steam engines in commercial usage. Steam turbines replaced reciprocating engines in power generation, due to lower cost, higher operating speed, higher efficiency; the first recorded rudimentary steam-powered "engine" was the aeolipile described by Hero of Alexandria, a mathematician and engineer in Roman Egypt in the first century AD.
In the following centuries, the few steam-powered "engines" known were, like the aeolipile experimental devices used by inventors to demonstrate the properties of steam. A rudimentary steam turbine device was described by Taqi al-Din in Ottoman Egypt in 1551 and by Giovanni Branca in Italy in 1629. Jerónimo de Ayanz y Beaumont received patents in 1606 for 50 steam powered inventions, including a water pump for draining inundated mines. Denis Papin, a Huguenot refugee, did some useful work on the steam digester in 1679, first used a piston to raise weights in 1690; the first commercial steam-powered device was a water pump, developed in 1698 by Thomas Savery. It used condensing steam to create a vacuum which raised water from below and used steam pressure to raise it higher. Small engines were effective, they were prone to boiler explosions. Savery's engine was used in mines, pumping stations and supplying water to water wheels that powered textile machinery. Savery engine was of low cost. Bento de Moura Portugal introduced an improvement of Savery's construction "to render it capable of working itself", as described by John Smeaton in the Philosophical Transactions published in 1751.
It continued to be manufactured until the late 18th century. One engine was still known to be operating in 1820; the first commercially-successful engine that could transmit continuous power to a machine, was the atmospheric engine, invented by Thomas Newcomen around 1712. It improved on Savery's steam pump. Newcomen's engine was inefficient, used for pumping water, it worked by creating a partial vacuum by condensing steam under a piston within a cylinder. It was employed for draining mine workings at depths hitherto impossible, for providing reusable water for driving waterwheels at factories sited away from a suitable "head". Water that passed over the wheel was pumped up into a storage reservoir above the wheel. In 1720 Jacob Leupold described a two-cylinder high-pressure steam engine; the invention was published in his major work "Theatri Machinarum Hydraulicarum". The engine used two heavy pistons to provide motion to a water pump; each piston was returned to its original position by gravity.
The two pistons shared a common four way rotary valve connected directly to a steam boiler. The next major step occurred when James Watt developed an improved version of Newcomen's engine, with a separate condenser. Boulton and Watt's early engines used half as much coal as John Smeaton's improved version of Newcomen's. Newcomen's and Watt's early engines were "atmospheric", they were powered by air pressure pushing a piston into the partial vacuum generated by condensing steam, instead of the pressure of expanding steam. The engine cylinders had to be large because the only usable force acting on them was atmospheric pressure. Watt developed his engine further, modifying it to provide a rotary motion suitable for driving machinery; this enabled factories to be sited away from rivers, accelerated the pace of the Industrial Revolution. The meaning of high pressure, together with an actual value above ambient, depends on the era in which the term was used. For early use of the term Van Reimsdijk refers to steam being at a sufficiently high pressure that it could be exhausted to atmosphere without reliance on a vacuum to enable it to perform useful work.
Ewing states that Watt's condensing engines were known, at the time, as low pressure compared to high pressure, non-condensing engines of the same period. Watt's patent prevented others from making high pres
Saint Paul, Minnesota
Saint Paul is the capital and second-most populous city of the U. S. state of Minnesota. As of 2017, the city's estimated population was 309,180. Saint Paul is the county seat of Ramsey County, the smallest and most densely populated county in Minnesota; the city lies on the east bank of the Mississippi River in the area surrounding its point of confluence with the Minnesota River, adjoins Minneapolis, the state's largest city. Known as the "Twin Cities", the two form the core of Minneapolis–Saint Paul, the 16th-largest metropolitan area in the United States, with about 3.6 million residents. Founded near historic Native American settlements as a trading and transportation center, the city rose to prominence when it was named the capital of the Minnesota Territory in 1849; the Dakota name for Saint Paul is "Imnizaska". Though Minneapolis is better-known nationally, Saint Paul contains the state government and other important institutions. Regionally, the city is known for the Xcel Energy Center, home of the Minnesota Wild, for the Science Museum of Minnesota.
As a business hub of the Upper Midwest, it is the headquarters of companies such as Ecolab. Saint Paul, along with its twin city, Minneapolis, is known for its high literacy rate; the settlement began at present-day Lambert's Landing, but was known as Pig's Eye after Pierre "Pig's Eye" Parrant established a popular tavern there. When Lucien Galtier, the first Catholic pastor of the region, established the Log Chapel of Saint Paul, he made it known that the settlement was now to be called by that name, as "Saint Paul as applied to a town or city was well appropriated, this monosyllable is short, sounds good, it is understood by all Christian denominations". Burial mounds in present-day Indian Mounds Park suggest that the area was inhabited by the Hopewell Native Americans about two thousand years ago. From the early 17th century until 1837, the Mdewakanton Dakota, a tribe of the Sioux, lived near the mounds after fleeing their ancestral home of Mille Lacs Lake from advancing Ojibwe, they called the area I-mni-za ska dan for its exposed white sandstone cliffs.
In the Menominee language it is called Sāēnepān-Menīkān, which means "ribbon, silk or satin village", suggesting its role in trade throughout the region after the introduction of European goods. Following the Louisiana Purchase in 1803, US Army officer Zebulon Pike negotiated 100,000 acres of land from the local Dakota tribes in 1805 to establish a fort; the negotiated territory was located on both banks of the Mississippi River, starting from Saint Anthony Falls in present-day Minneapolis, to its confluence with the Saint Croix River. Fort Snelling was built on the territory in 1819 at the confluence of the Mississippi and Minnesota rivers, which formed a natural barrier to both Native American nations; the 1837 Treaty with the Sioux ceded all local tribal land east of the Mississippi to the U. S. Government. Taoyateduta moved his band at Kaposia across the river to the south. Fur traders and missionaries came to the area for the fort's protection. Many of the settlers were French-Canadians. However, as a whiskey trade flourished, military officers banned settlers from the fort-controlled lands.
Pierre "Pig's Eye" Parrant, a retired fur trader-turned-bootlegger who irritated officials, set up his tavern, the Pig's Eye, near present-day Lambert's Landing. By the early 1840s, the community had become important as a trading center and a destination for settlers heading west. Locals called Pig's Eye Landing after Parrant's popular tavern. In 1841, Father Lucien Galtier was sent to minister to the Catholic French Canadians and established a chapel, named for his favorite saint, Paul the Apostle, on the bluffs above Lambert's Landing. Galtier intended for the settlement to adopt the name Saint Paul in honor of the new chapel. In 1847, a New York educator named Harriet Bishop moved to the area and opened the city's first school; the Minnesota Territory was formalized in Saint Paul named as its capital. In 1857, the territorial legislature voted to move the capital to Saint Peter. However, Joe Rolette, a territorial legislator, stole the physical text of the approved bill and went into hiding, thus preventing the move.
On May 11, 1858, Minnesota was admitted to the union as the thirty-second state, with Saint Paul as the capital. That year, more than 1,000 steamboats were in service at Saint Paul, making the city a gateway for settlers to the Minnesota frontier or Dakota Territory. Natural geography was a primary reason; the area was the last accessible point to unload boats coming upriver due to the Mississippi River Valley's stone bluffs. During this period, Saint Paul was called "The Last City of the East." Industrialist James J. Hill constructed and expanded his network of railways into the Great Northern Railway and Northern Pacific Railway, which were headquartered in Saint Paul. Today they are collectively part of the BNSF Railway. On August 20, 1904, severe thunderstorms and tornadoes damaged hundreds of downtown buildings, causing USD $1.78 million in damages to the city and ripping spans from the High Bridge. In the 1960s, during urban renewal, Saint Paul razed western neighborhoods close to downtown.
The city contended with the creation of the interstate freeway system in a built landscape. From 1959 to 1961, the western Rondo Neighborhood was demolished by the construction of Interstate 94, which brought attention to racial segregation and unequal housing in northern cities; the annual
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
President of the United States
The president of the United States is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces. In contemporary times, the president is looked upon as one of the world's most powerful political figures as the leader of the only remaining global superpower; the role includes responsibility for the world's most expensive military, which has the second largest nuclear arsenal. The president leads the nation with the largest economy by nominal GDP; the president possesses international hard and soft power. Article II of the Constitution establishes the executive branch of the federal government, it vests the executive power of the United States in the president. The power includes the execution and enforcement of federal law, alongside the responsibility of appointing federal executive, diplomatic and judicial officers, concluding treaties with foreign powers with the advice and consent of the Senate.
The president is further empowered to grant federal pardons and reprieves, to convene and adjourn either or both houses of Congress under extraordinary circumstances. The president directs the foreign and domestic policies of the United States, takes an active role in promoting his policy priorities to members of Congress. In addition, as part of the system of checks and balances, Article I, Section 7 of the Constitution gives the president the power to sign or veto federal legislation; the power of the presidency has grown since its formation, as has the power of the federal government as a whole. Through the Electoral College, registered voters indirectly elect the president and vice president to a four-year term; this is the only federal election in the United States, not decided by popular vote. Nine vice presidents became president by virtue of a president's intra-term resignation. Article II, Section 1, Clause 5 sets three qualifications for holding the presidency: natural-born U. S. citizenship.
The Twenty-second Amendment precludes any person from being elected president to a third term. In all, 44 individuals have served 45 presidencies spanning 57 full four-year terms. Grover Cleveland served two non-consecutive terms, so he is counted twice, as both the 22nd and 24th president. Donald Trump of New York is the current president of the United States, he assumed office on January 20, 2017. In July 1776, during the American Revolutionary War, the Thirteen Colonies, acting jointly through the Second Continental Congress, declared themselves to be 13 independent sovereign states, no longer under British rule. Recognizing the necessity of coordinating their efforts against the British, the Continental Congress began the process of drafting a constitution that would bind the states together. There were long debates on a number of issues, including representation and voting, the exact powers to be given the central government. Congress finished work on the Articles of Confederation to establish a perpetual union between the states in November 1777 and sent it to the states for ratification.
Under the Articles, which took effect on March 1, 1781, the Congress of the Confederation was a central political authority without any legislative power. It could make its own resolutions and regulations, but not any laws, could not impose any taxes or enforce local commercial regulations upon its citizens; this institutional design reflected how Americans believed the deposed British system of Crown and Parliament ought to have functioned with respect to the royal dominion: a superintending body for matters that concerned the entire empire. The states were out from under any monarchy and assigned some royal prerogatives to Congress; the members of Congress elected a President of the United States in Congress Assembled to preside over its deliberation as a neutral discussion moderator. Unrelated to and quite dissimilar from the office of President of the United States, it was a ceremonial position without much influence. In 1783, the Treaty of Paris secured independence for each of the former colonies.
With peace at hand, the states each turned toward their own internal affairs. By 1786, Americans found their continental borders besieged and weak and their respective economies in crises as neighboring states agitated trade rivalries with one another, they witnessed their hard currency pouring into foreign markets to pay for imports, their Mediterranean commerce preyed upon by North African pirates, their foreign-financed Revolutionary War debts unpaid and accruing interest. Civil and political unrest loomed. Following the successful resolution of commercial and fishing disputes between Virginia and Maryland at the Mount Vernon Conference in 1785, Virginia called for a trade conference between all the states, set for September 1786 in Annapolis, with an aim toward resolving further-reaching interstate commercial antagonisms; when the convention failed for lack of attendance due to suspicions among most of the other states, Alexander Hamilton led the Annapolis delegates in a call for a convention to offer revisions to the Articles, to be held the next spring in Philadelphia.
Prospects for the next convention appeared bleak until James Madison and Edmund Randolph succeeded in securing George Washington's attendance to Philadelphia as a delegate for Virginia. When the Constitutional Convention convened in May 1787, the 12 state delegations in attendance (Rh
Millard Fillmore was the 13th president of the United States, the last to be a member of the Whig Party while in the White House. A former U. S. Representative from New York, Fillmore was elected the nation's 12th vice president in 1848, succeeded to the presidency in July 1850 upon the death of President Zachary Taylor, he was instrumental in getting the Compromise of 1850 passed, a bargain that led to a brief truce in the battle over slavery. He failed to win the Whig nomination for president in 1852. Fillmore was born into poverty in the Finger Lakes area of New York state—his parents were tenant farmers during his formative years. Though he had little formal schooling, he rose from poverty through diligent study and became a successful attorney, he became prominent in the Buffalo area as an attorney and politician, was elected to the New York Assembly in 1828, to the U. S. House of Representatives in 1832, he belonged to the Anti-Masonic Party, but became a Whig as the party formed in the mid-1830s.
Through his career, Fillmore declared slavery an evil, but one beyond the powers of the federal government, whereas Seward was not only hostile to slavery, he argued that the federal government had a role to play in ending it. Fillmore was an unsuccessful candidate for Speaker of the House when the Whigs took control of the chamber in 1841, but was made Ways and Means Committee chairman. Defeated in bids for the Whig nomination for vice president in 1844, for New York governor the same year, Fillmore was elected Comptroller of New York in 1847, the first to hold that post by direct election; as vice president, Fillmore was ignored by Taylor in the dispensing of patronage in New York, on which Taylor consulted Weed and Seward. In his capacity as President of the Senate however, he presided over angry debates in the Senate as Congress decided whether to allow slavery in the Mexican Cession. Fillmore supported Henry Clay's Omnibus Bill. Upon becoming president in July 1850, Fillmore dismissed Taylor's cabinet and carried out his own policy priorities.
He began by exerting pressure on Congress to pass the Compromise, highlighting how it gave legislative victories to both North and South – the five-bill package was approved and enacted into law that September. The Fugitive Slave Act, expediting the return of escaped slaves to those who claimed ownership, was a controversial part of the Compromise, Fillmore felt himself duty-bound to enforce it, though it damaged his popularity and the Whig Party, torn North from South. In foreign policy, Fillmore supported U. S. Navy expeditions to open trade in Japan, opposed French designs on Hawaii, was embarrassed by Narciso López's filibuster expeditions to Cuba, he sought election to a full term in 1852, but was passed over by the Whigs in favor of Winfield Scott. As the Whig Party broke up after Fillmore's presidency, many in Fillmore's conservative wing joined the Know Nothings, forming the American Party. In his 1856 candidacy as that party's nominee, Fillmore had little to say about immigration, focusing instead on the preservation of the Union, won only Maryland.
In retirement, Fillmore was active in many civic endeavors—he helped in founding the University of Buffalo and served as its first chancellor. During the American Civil War, Fillmore denounced secession and agreed that the Union must be maintained by force if necessary, but was critical of the war policies of Abraham Lincoln. After peace was restored, he supported the Reconstruction policies of President Andrew Johnson. Though he is obscure today, Fillmore has been praised by some, for his foreign policy, criticized by others, for his enforcement of the Fugitive Slave Act and his association with the Know Nothings. Historians and scholars have ranked Fillmore as one of the worst presidents, debate continues on to this day concerning whether Fillmore escalated the civil war by signing the Compromise of 1850. Millard Fillmore was born January 7, 1800 in a log cabin, on a farm in what is now Moravia, Cayuga County, in the Finger Lakes region of New York, his parents were Phoebe and Nathaniel Fillmore—he was the second of eight children and the oldest son.
Nathaniel Fillmore was the son of Nathaniel Fillmore Sr. a native of Franklin, Connecticut who became one of the earliest settlers of Bennington when it was founded in the territory called the New Hampshire Grants. Nathaniel Fillmore and Phoebe Millard moved from Vermont in 1799, seeking better opportunities than were available on Nathaniel's stony farm, but the title to their Cayuga County land proved defective, the Fillmore family moved to nearby Sempronius, where they leased land as tenant farmers, Nathaniel taught school. Historian Tyler Anbinder described Fillmore's childhood as, "...one of hard work, frequent privation, no formal schooling". Over time Nathaniel became more successful in Sempronius, though during Millard’s formative years the family endured severe poverty. Nathaniel became sufficiently regarded that he was chosen to serve in local offices including justice of the peace. In hopes his oldest son would learn a trade, he convinced Millard at age 14 not to enlist for the War of 1812 and apprenticed him to cloth maker Benjamin Hungerford in Sparta.
Fillmore was relegated to menial labor. His father placed him in the same trade at a mill in New Hope. Seeking to better him
Canadian Pacific 2816
Canadian Pacific 2816, named Empress, is a 4-6-4 H1b Hudson type steam locomotive built by the Montreal Locomotive Works in 1930 for the Canadian Pacific Railway. After being used for heavy passenger service, the locomotive was retired in 1960 and donated to Steamtown, USA at Bellows Falls, Vermont in 1964. After an extensive restoration, the locomotive returned to service in 2001 and was used by the Canadian Pacific Railway in occasional excursion service until 2012; the 2816 is the only non-streamlined H1 Hudson to have survived into preservation. No. 2816 was one of ten H1b-class 4-6-4 Hudson built by the Montreal Locomotive Works in late 1930. It was first assigned to Fort William, Ontario, it was transferred to service between Windsor and Quebec City, it ran a commuter train between Montreal and Rigaud, Quebec. It made its last run on May 1960, after more than 2 million miles in active service. In January 1964, the locomotive was sold to Steamtown, USA, which evolved into the Steamtown National Historic Site in 1986.
When Steamtown USA moved from Bellows Falls, Vermont, to Scranton, Pennsylvania, in the 1980s, No. 2816 was relocated to the new site with the rest of the collection. When the National Park Service took over from the Steamtown Foundation, No. 2816 moved to the Steamtown National Historic Site, the NPS decided to divest itself of foreign locomotives. In September 1998, the Canadian Pacific purchased No. 2816 after hearing of its availability from the crews who were running the Royal Hudson No. 2860, looking for parts for 2860 and were offered the entire locomotive. The locomotive was transported from Scranton to Montreal via Binghamton and Albany, New York, before being shipped cross country to the BC Rail steam shops in Vancouver for restoration; the locomotive was stripped down and rebuilt, "the most thorough rebuild undertaken on a steam locomotive in North America since the end of their era" according to CPR News. The restoration team was able to use over 800 technical drawings of CPR Hlb class locomotives from the Canada Science and Technology Museum to restore 2816 to its 1950s appearance and to its original specifications.
During restoration, the locomotive was converted to burn oil and equipped with modern amenities such as a radio and a diesel control unit. The restoration took over two years and cost over $2,000,000, making it one of the most costly locomotive restorations in Canada. CPR was confident in the restoration enough to announce on April 19, 2000, that 2816 would become an ambassador for the railway in the railway's new heritage steam program. In September 2001, the locomotive made its first trial run from the BC Rail steam shops to its new home of Calgary, it rejoined the Canadian Pacific fleet as a special excursion locomotive and for public relations. Among other uses, 2816 is used to raise money for school lunch programs and the Children's Wish Foundation. Between 2001 and 2012, 2816 travelled across the United States; the 2816 is one of the most well-known locomotives in North America, along with Milwaukee Road 261, Southern Pacific 4449, Union Pacific 844, Union Pacific 3985, Santa Fe 3751, Norfolk & Western 611, Norfolk & Western 1218, Pere Marquette 1225, Nickel Plate 765 and Royal Hudson 2860.
At the end of the 2008 season, Canadian Pacific put the steam program on hold due to financial issues caused by the poor economy. 2816 did not operate at all in 2009, although the steam program was able to take advantage of this down time to do some extensive maintenance work on 2816 and its passenger car fleet. 2816 returned to operation on June 6, 2010. It was used in Rocky Mountain Express, a 2011 IMAX film which follows the locomotive on a journey from Vancouver to Montreal while telling the CPR's history. In 2012, Canadian Pacific CEO Fred Green stepped down and E. Hunter Harrison succeeded him. Harrison discontinued the steam program; because of this, No. 2816's excursion operations were ceased and the locomotive is in storage at Calgary with its future in limbo. Harrison died with the locomotive's future still in doubt. Of the five surviving Canadian Pacific Hudsons out of the original 65 built between 1929 and 1940, the 2816 is the only survivor of the non-streamlined H1a and H1b classes built in 1929 and 1930 numbered 2800–2819.
The four other remaining sister engines to 2816 are the semi-streamlined Royal Hudsons numbered 2820–2864. The remaining Royal Hudsons are numbers 2839, 2850 and 2858 and the 2860. 2816 and 2860 are the only operating 4-6-4 Hudsons in North America. Rocky Mountain Express CP 2816 Empress
A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is constructed for the purpose of providing passage over the obstacle something that can be detrimental to cross otherwise. There are many different designs that each serve a particular purpose and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, the funds available to build it. Most the earliest bridges were fallen trees and stepping stones, while Neolithic people built boardwalk bridges across marshland; the Arkadiko Bridge dating from the 13th century BC, in the Peloponnese, in southern Greece is one of the oldest arch bridges still in existence and use. The Oxford English Dictionary traces the origin of the word bridge to an Old English word brycg, of the same meaning; the word can be traced directly back to Proto-Indo-European *bʰrēw-.
The word for the card game of the same name has a different origin. Before the rise of humanity, ants have been making bridges by using their own to allow others to cross; the simplest type of a bridge is stepping stones, so this may have been one of the earliest types. Neolithic people built a form of boardwalk across marshes, of which the Sweet Track and the Post Track, are examples from England that are around 6000 years old. Undoubtedly ancient peoples would have used log bridges; some of the first man-made bridges with significant span were intentionally felled trees. Among the oldest timber bridges is the Holzbrücke Rapperswil-Hurden crossing upper Lake Zürich in Switzerland; the first wooden footbridge led across Lake Zürich, followed by several reconstructions at least until the late 2nd century AD, when the Roman Empire built a 6-metre-wide wooden bridge. Between 1358 and 1360, Rudolf IV, Duke of Austria, built a'new' wooden bridge across the lake, used to 1878 – measuring 1,450 metres in length and 4 metres wide.
On April 6, 2001, the reconstructed wooden footbridge was opened, being the longest wooden bridge in Switzerland. The Arkadiko Bridge is one of four Mycenaean corbel arch bridges part of a former network of roads, designed to accommodate chariots, between the fort of Tiryns and town of Epidauros in the Peloponnese, in southern Greece. Dating to the Greek Bronze Age, it is one of the oldest arch bridges still in use. Several intact arched stone bridges from the Hellenistic era can be found in the Peloponnese; the greatest bridge builders of antiquity were the ancient Romans. The Romans built arch bridges and aqueducts that could stand in conditions that would damage or destroy earlier designs; some stand today. An example is the Alcántara Bridge, built over the river Tagus, in Spain; the Romans used cement, which reduced the variation of strength found in natural stone. One type of cement, called pozzolana, consisted of water, lime and volcanic rock. Brick and mortar bridges were built after the Roman era.
In India, the Arthashastra treatise by Kautilya mentions the construction of bridges. A Mauryan bridge near Girnar was surveyed by James Princep; the bridge was swept away during a flood, repaired by Puspagupta, the chief architect of emperor Chandragupta I. The use of stronger bridges using plaited bamboo and iron chain was visible in India by about the 4th century. A number of bridges, both for military and commercial purposes, were constructed by the Mughal administration in India. Although large Chinese bridges of wooden construction existed at the time of the Warring States period, the oldest surviving stone bridge in China is the Zhaozhou Bridge, built from 595 to 605 AD during the Sui dynasty; this bridge is historically significant as it is the world's oldest open-spandrel stone segmental arch bridge. European segmental arch bridges date back to at least the Alconétar Bridge, while the enormous Roman era Trajan's Bridge featured open-spandrel segmental arches in wooden construction. Rope bridges, a simple type of suspension bridge, were used by the Inca civilization in the Andes mountains of South America, just prior to European colonization in the 16th century.
During the 18th century there were many innovations in the design of timber bridges by Hans Ulrich Grubenmann, Johannes Grubenmann, others. The first book on bridge engineering was written by Hubert Gautier in 1716. A major breakthrough in bridge technology came with the erection of the Iron Bridge in Shropshire, England in 1779, it used cast iron for the first time as arches to cross the river Severn. With the Industrial Revolution in the 19th century, truss systems of wrought iron were developed for larger bridges, but iron does not have the tensile strength to support large loads. With the advent of steel, which has a high tensile strength, much larger bridges were built, many using the ideas of Gustave Eiffel. In Canada and the U. S. numerous timber Covered bridges were built in the late 1700s to the late 1800s, reminiscent of earlier designs in Germany and Switzerland. In years, some were made of stone or metal but the trusses were still made of wood. Hundreds of these structures still stand in North America.
They were brought to the attention of the general public in