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Socioeconomic and policy-making env cast-ironments Essay later the Civil struggle, capital letter returned to the family cable, assisting in terminate two much suspension link up across the Ohio River (Invention Factory 2007). During this time Washingtons father, John, became interested in building a connect across the eastern close River. New York legislators finally realized the need for a route over the East River and passed a bill for some sort of construction. The largest restriction that the plans for the structure had to abide by was its height over the river, which was set to avoid contact with masts of ships that passes on a lower floor it. This idea of a link was no social occasion refreshful. For 60 years, opposite paths of linking Brooklyn and New York had been considered (Trachtenberg 1965). Soon, the city of New York set up the first ferries from Manhattan to Brooklyn in 1812 but more(prenominal) versatile transit was needed. The Brooklyn Bridge was erected out of economic necessity and urban sprawl (Brooke and Davidson 2006). New York city was a huge immigration hub. In the mid-1800s, men and women began to emigrate from Europe and some(prenominal) settled in Brooklyn. As a result, many lived in boarding houses.Brooklyn at this time consisted mainly of Irish immigrants. Immigrants were give really poorly considered the work they per causeed as it was always the virtually demanding and risky. From 1860 to 1870, Brooklyns population growth was 50 percent the fastest growing city at the time (Trachtenberg 1965). Manhattan was the opposite of Brooklyn, in that it was primarily a craft district in the mid 1800s. Approximately 40 percent of wager earners in Brooklyn had jobs in Manhattan. The northeastern coast was a major hub for imports and manufacturing goods after the Erie Canal was built.At the time the single way to get from Manhattan to Brooklyn was by fairy which was often slow and hampered by storms. Taking the ferri es tended to be very dangerous. Plans for a either a bridge or a tunnel over the East River were interrupted by the Civil War. Bridges were thought to be impossible as no materials where known to be substantial enough to support the needed span. Part of the problem was that the bridge needed to be high supra the channel to allow masted ships to pass beneath it, even at high tide. These details had proven insurmountable until then.A fleet of ferries shuttled people and goods across the river every daylight. John Roebling, with his wire rope business and business relationship of successful suspension bridges, had a viable solution (Invention Factory 2007). The Brooklyn Bridge would use brace in its cables. Good wrought iron breaks at 30 gobs where good stigma of the lovablered size breaks at 75 tons (2. 5 times stronger) (stag 1967). While it was non trusted at the time because of its newness, the Roeblings had faith in its strength. At the time, suspension bridges were viewe d with suspicion.Many had failed in storms or under(a) live loads however, n unmatchable of the bridges John had built had ever failed. One of the reasons he had succeeded was that he made them very stiff, preventing flexing from wind that would plague other suspension bridge builders into the next century and around famously in the Tacoma Narrows Bridge in 1940, more than 70 years after John. After overdue debate, the Brooklyn Bridge gild was formed with John Roebling as chief engineer (Invention Factory 2007). One thing that the times lent to the project was a good source of cheap labor.Poor immigrants, mainly Irish, were the ones who worked the most on the bridge. They also took the brunt of the casualties. Approximately 20-30 people died during construction and administration viewed it as necessary and unavoidable. Labor was very manual and at the time workers had very trivial power in politics. The Irish workers did not wassail the choice of date, as it coincided with th e Queens birthday. Technological Context Construction Details In celestial latitude 1849, an accident mangled Roeblings fathers left hand while undergoing testing on the innovative wire rope machinery.This new technology would set this bridge far ahead of its time, utilizing a braded configuration allowing flexibility and easier handling (Trachtenberg 1965). The Brooklyn Bridge would use brand name in its cables. Good wrought iron breaks at 30 tons where good steel of the same size breaks at 75 tons (2. 5 times stronger) (Hart 1967). While steel was not trusted at the time because of its newness, the Roeblings had faith in its strength. At the time, steel or no steel, suspension bridges were viewed with suspicion. Many had failed in storms or under live loads however, none of the bridges John had built had ever failed.One of the reasons he had succeeded was that he made them very stiff, preventing flexing from wind that would plague other suspension bridge builders into the next c entury and most famously in the Tacoma Narrows Bridge in 1940, more than 70 years after Johns lifetime. Construction was very hazardous at that time, even for chief engineers. At the start of the project, the Brooklyn Bridge Company lost a crucial member. A ferryboat crushed John Roeblings foot when he was on site. After having his toes amputated, during which he declined anesthetic, an infection set in and killed him (ENDEX applied science 2007).Surprisingly there was little debate over who should succeed him. Washington Roebling was already deeply involved with the project so he was appointed successor (Invention Factory 2007). In 1872 disaster struck again. Washington himself was down in the caissons more than any one else. He was suddenly struck with what was called caisson sickness, and is what is modernly called the bends (Invention Factory 2007). This disease was not understood at the time and results from prolonged exposure to high pressures and then sudden decompression, allowing nitrogen bubbles to form in blood and possibly clog them.Washington was not the first to fall ill from the bends, in fact, people had already died of it but work proceeded on. After coming back even though intelligibly sick, Washington was cheatridden, crippled for the remainder of the project. He was only able to stand for 10 minutes at a time when the bridge opened in 1883 (Smithsonian Associates 2004). Washington remained head engineer giving orders from his bed but the person most visible to visitors at the project was his wife, Emily. She knew just as much around the project as Washington.When a board of enquiry was put together to try to oust the sick head engineer she removed sufficient doubt from its members for Roebling to stay (Smithsonian Associates 2004). To say she was the head engineer would only be a very slight exaggeration. The towers that supported the span were made out of limestone, granite and concrete. Newly piece techniques for making steel made it a cheap, strong metal for the suspension cables (Hart 1967). The first order of business was to sink the two giant caissons into the riverbed to support the towers (Figure 1).These were made of 12 x 12 yellow pine beams and weighed by themselves 3000 tons, having 15 foot thick roofs to keep the excavators from getting crushed by the ultimately 80,000 tons of rock piled on top to make up the Towers. John found a new way to devise a foundation. The caissons were floated into place and then sunk into position, driven downward by the towers on top and crews underneath removing the effective riverbed (ENDEX technology 2007). Once they reached solid ground the caissons would be handle full of grout and serve as a perfect foundation. They were undoubtedly the most tedious and knotty part of the bridge construction.Excavation methods consisted of shovel, pick, wheelbarrow, steel bar stone breakers, winches, and ten ton hydraulic jacks, ultimately blasting after Washington Roebling conducted a series of experiments in the caisson. Initial rate of caisson shot and lowering produced 6 inches per week, with a workforce of 360 people constructing the bridge (Trachtenberg 1965). Compressed air was used in the caissons to keep the water out, and the deeper they got (78 feet on the New York side, 45 feet on the Brooklyn side) the higher the pressure needed (ENDEX Engineering 2007). This was dangerous in more way than one.Fires could be catastrophic, and occasionally there would be a hoyden that subsequently would allow water back in. The largest of these air releases blew rocks and mud 500 feet into the air in 1870. Fires, from employ dynamite, were the worst however. One was found smoldering in the 15 feet of wood under the Brooklyn Caisson, fed by compressed air (ENDEX Engineering 2007). Eventually some timbers were replaced and the rest of the holes were pumped full of grout. The New York caisson was stopped after 78 feet not because it had reached rock but bec ause conditions had become intolerable.As a result, to this day it rests on sand surprisingly stable (ENDEX Engineering 2007). The Brooklyn and New York Towers were completed in 1875 and 1876 respectively (ENDEX Engineering 2007). The cables were strung after the completion of the towers. Perhaps the greatest calamity struck in the middle of this. A cable snapped, killing two men, and it was found to be very substandard (ENDEX Engineering 2007). Incidentally, the contractor who supplied the steel cable was not John Roeblings Sons Co, which at the time was owned exclusively by Washingtons brothers. The cables were flawed.Eventually, the wire in all the cables, including 1520 suspenders and 400 diagonal stays, was approximately 3600 miles long (ENDEX Engineering 2007). ad hominem Characteristics Washington fought in the civil war both on the ground as a military observer from hot air balloons. Washington served at Gettysburg with distinction on Little Round upside and was at the si ege of Richmond (Invention Factory 2007). He became very noble and selfless, though cocky at times, during the Civil War. Perhaps the most important part of his war career, however, was that he met his wife to be, Emily warren, because he served under her brother, General G.K. Warren (ENDEX Engineering 2007).He ended the war at the rank of a Colonel. After the war he helped his father build the Cincinnati-Covington Bridge (now called John A. Roebling Suspension Bridge) before the Brooklyn Bridge. Despite many the huge hurdles of the Brooklyn Bridge project, among which was the fact that Washington became horribly sick and bedridden for most of the actual building from decompression sickness when the huge caissons for the twin towers were sunk in the Hudson riverbed (hence the traditional boundary caisson sickness), he managed to oversee all stages of its construction.He did this only with the help of his wife Emily Warren Roebling, who almost every day visited the site and reporte d to him and who some felt built the bridge herself (The keen Engineers, 1967). The Brooklyn Bridge was opened May 24th 1883 by the death chair of the United States U. S. Grant, to fireworks and one cent tatter passes to cross. Apparently it was a great relief to Washington Roebling as his health began to slowly improve.After the completing this engineering marvel in 1883, Washington lived a relatively quiet life, mostly as a result of being still partially crippled from his illness, and when his wife died in 1903 he remarried in 1908. He spent much of his time collecting minerals, which was his one great hobby, eventually having 16,000 specimens and ending up in the Museum of Natural Historys mineral and gem collection (Smithsonian Associates 2004). This hobby added balance to his life and in all probability kept him from accomplishing very much else as it took so much of his time. He outlived his wife Emily and remarried.He became president of his fathers company, John Roeblin gs Sons, in 1921 at the age of 79. He brought incredible energy to the position, modernizing the factory with electricity and adding a galvanized wire section. The business prospered under his leadership until 1926, when Washington Roebling died. When one has hobbies such as athletic contest help keeps a healthy time management of school work and fun down time. College is one of the few times were one can have fun. There is a time and place to know your hobbies but to enjoy these hobbies one must put in an honest days work. demonstrationWhen the Brooklyn Bridge opened to traffic on May 24th 1883, it was one of the grandest engineering marvels of that century in North America. The construction was composed of many firsts. Despite innumerable setbacks, including the untimely death of the original room decorator of the plan, John A. Roebling, and the crippling of his son, Washington Roebling, who succeeded him in the chief engineer duties it, was finished in 14 years, having been commenced January 2, 1870. At the time of completion it was 50% longer than any other suspension bridge, it was the first to use steel cables, much stronger than hemp or cast iron previously used.The towers that supported the four main cables (each of which supports a total dead live load of about 6 million pounds) for the span were the largest stone and masonry objects of their kind rising approximately 276 feet above the high water mark (Smithsonian Associates 2004). The challenges of this are hard to fathom in todays world of reinforced concrete. Appendices Figure 1. Sinking the Caisson into the Riverbed Table 2Brooklyn Bridge Innovations 1st suspension bridge to use steel 1st suspension bridge to structure the wire 1st bridge to use pneumatic caissons 1st to use dynamite in bridge construction 1st female field engineer Longest bridge constructed Tallest structure in the western sandwich hemisphere Considered to be the 8th Wonder of the World.Bibliography Biography Invention F actory 2007. The Smithsonian Associates Civil War E-Mail Newsletter, Vol 3, No 9. Smithsonian Associates 2004. http//civilwarstudies. org/articles/Vol_3/roebling. htm Brooke and Davidson 2006, Kathleen L. , and Frank P. Davidson. Building the World. Vol. 1. Westport, Connecticut Greenwood P, 2006. 240.Brooklyn Bridge Facts, History, and Information. ENDEX Engineering, Inc. 5 May 1998. 29 Mar. 2007 http//www. endex. com/gf/buildings/bbridge/bbridgefacts. htm. Hart 1967, Ivor B. The Great Engineers. Freeport, N. Y. Books for Libraries P, 1967. Trachtenberg, Alan. Brooklyn Bridge Fact and Symbol. New York, New York Oxford UP, 1965. 11. Invention Factory 2007. John a. Reoblings Sons Co. 28 Mar. 2007 http//www. inventionfactory. com/history/RHAgen/warbio. html. Wikipedia Update April 1, 2007 at 813 p. m. http//en. wikipedia. org/wiki/Washington_Roebling.