David McCullough’s The Great Bridge, chronicles the building of the Brooklyn Bridge. McCullough gives several reasons as to why the bridge is historically significant and showcased late 19th century technology. John Roebling, designer and engineer of the bridge, along with his son Washington Roebling created the masterpiece that is a symbol of Brooklyn and America. Technology, commerce, and politics all played a role in this colossal undertaking in American history.
John Roebling, a German immigrant and engineer, had successfully overseen the creation of several suspension aqueducts in Pennsylvania. Through this work, he developed his unique technique of attaching cables to iron eyebars embedded in masonry, that “he would use in every bridge he built thereafter.” Going wire by wire, the cables were strung in place, very similar to how his future bridges would be. (p. 50). The Allegheny River Bridge was the first to use his idea in which “…. cables had been spun on the bridge itself by a traveling wheel that went back and forth, stringing the wire over the towers, from shore to shore…”(p. 65) This idea was what he planned to use in building the bridge over the East River. The Niagara Bridge, “…the first truly modern suspension bridge…. was where … Roebling had demonstrated…that the principles of suspension could be applied with perfect safety even to something so heavy as a locomotive and railroad, and…. had a profound effect of the whole evolution of bridge designs.” (p. 74) The stays, which created a gigantic web, came down from the suspenders, connecting cables to the roadway. “Every diagonal stay, …formed the hypotenuse of a right triangle…. and thus provided tremendous stability….” (p. 67)
William Roebling, after leaving service in the Civil War, joined his father in 1859 and helped complete the Cincinnati Bridge. Afterwards, John sent William and his wife, Emily, to travel extensively through Europe learning about iron works, metallurgy developments -especially the new Bessemer steel process, the wire-making process, and pneumatic caissons. William had a brilliant memory and wrote extensive and detailed letters to his father about all of the technical processes he was learning about and being exposed to. William and his knowledge base became an important part of the design process that his father John incorporated into his plans and schematics. The Brooklyn Bridge was to be the largest suspension bridge in the world, lengthwise and width wise. The bridge needed to be constructed in such a manner that water traffic below would not be constricted. John died from complications of lockjaw, due to an accident that caught his foot and crushed his toes, which had to be amputated. At this point, William took over Chief Engineer duties. William said later in life, he was “the only living man who had practical experience to build those great cables,” had studied pneumatic foundations and caissons, was not afraid of the 106′ below water level, and he had had assisted in his father’s design and “was therefore familiar with his ideas and the with whole project – and no one else was.” (p. 100). As such, William took over command of building the Brooklyn Bridge.
Commerce and profit were huge factors behind the construction of the Brooklyn Bridge. New York was filled with politicians and businessmen who understood the value of the bridge in pure monetary consideration. Current traffic on the ferries were making upwards of one thousand trips per day, full of passengers who spent the good part of the day on the ferry. Wintertime could see the ferries closed in by ice, making travel downright impossible, and stranding passengers on either side. Brooklyn, in the 19th century had a busier seaport, better schools, lower taxes and cheaper gas rates than New York, and the local government was thought to be honest. At the time, Brooklyn was the third largest city in the United States. It was just logical that Brooklyn and New York be connected by the greatest engineering feat of the time.
Technology at the end of the 19th century was beginning to boom. Electricity was being unveiled at the 1892 World’s Fair in Chicago. Alexander Graham Bell and his predecessors were playing with the forerunner to the telephone. The “iron horse” was crisscrossing the growing, young country. The use of pneumatic caissons and its related technology was put into use for the first time in the United States. One caisson was almost 17, 000 square feet, and the other one was not much smaller (p. 189). The bridge utilized the up and coming Bessemer steel process; a material that would give rise to New York’s skyline – skyscrapers. Medicine would benefit from the construction of the bridge due to the “caisson disease”, or “the bends” from being down at deep levels with compressed air. Dr. Andrew H. Smith presented suggestions for future projects of the same nature in his 1873 report to the New York Bridge Company. “The concept of the apparatus described by Smith…. is precisely the same as the so-called “hospital lock” used for modern bridge and tunnel construction, whenever men are working compressed air.” (p. 322)
A great deal of the early work was primarily constructed under water and under ground. The citizens of the area were not able to see anything changing, and questioned how money was being spent and wondering if anything was actually happening. Visual proof to the public about the construction would take longer than anticipated; putting the job over cost, while many people lost their lives and others became permanently disabled (p. 335, 336). Yet when the bridge was completed, people in New York City were finally connected in a manner that would allow year-around travel to and fro.
With the completion of the Brooklyn Bridge, no longer were people and commerce at the mercy of the elements. The grand opening of the bridge was celebrated on May 23, 1883, with Emily Roebling being the first person to be officially given a ride across the Brooklyn Bridge; all of the costs, problems, deaths, and tragedy forgotten. The growth of Brooklyn was destined to happen, as Manhattan was already extremely populated, and the successful completion of the bridge allowed this to freely happen. The end result was the uniting of Brooklyn, Queens, the Bronx, and Staten Island with Manhattan, creating the Greater New York. And one of the greatest engineering feats in modern American history was complete.








































perusing the lessons more extensively. The movie that was shown helped give a great overview of baseball for non-fans such as myself. Baseball is a great conduit for making connections in the classroom to historical events, modern times, and relationship building with students.













