The city of Chicago is the birthplace of the rationalist and utilitarian architecture that dominate

The nineteenth century is the century of industrialization and the first large population what is the population of canada explosion in Europe and North America. This raises new construction what is the population of canada needs: railways, bridges, industrial buildings, etc. We must build much faster and moderately priced. These new challenges require new solutions based on the same industry provides materials and also avoid calling the old prejudices inherited from formal academic tradition.
The use of iron as a key element in building what is the population of canada structures begins its application to bridges and railway stations. But soon, they are the great possibilities offered for any type of construction. They are engineers, trained in a utilitarian spirit, which introduce new materials, while traditional architects continue considering "creative beauty", "artists" in the traditional sense of the word, concerned only the form (and attached to the neoclassical academic and historicist what is the population of canada styles). Overcoming this contradiction false not come until the last years of the nineteenth century, the architects of the Chicago School and the modernists.
Labrouste Henry (1801-1875) is the first academic architect utlitzar iron as a base material and without hiding it with decorative coatings in the National Library in Paris; a reading room, the slender iron columns supporting what is the population of canada four times wider ends clay, creating an open space and a lightness, while reference retains stylistic turns. The outside has nothing to do with the innovative reading room, as Labrouste remodeled structures of the seventeenth and eighteenth century anachronism what is the population of canada that determine the facades respect of the interior. Although newer books are deposits with a space fully articulated vertical and horizontal metallic elements. At the time, the whole work was Labrouste an exceptional boldness.
But the great triumph of the architecture of iron and glass came with the Universal Exhibitions, large samples created to extol the achievements of industry, commerce and the arts; the first of these exhibitions was held in London what is the population of canada in 1851. In order to show the public the wide range of machines, works of art and products of all kinds needed a building of great extent, at the same time, it was exponent modernity and that could be mounted quickly; All these demands were met by Joseph Paxton (1803-1865) in Crystal Palace, vast warehouse based on the structure of greenhouses in which it was applied what is the population of canada for the first time, large-scale construction what is the population of canada with prefabricated modules. The Crystal Palace was destroyed by fire, but his record in the numerous buildings made Doman taking it as an example.
In successive Universal Exhibitions, Galleries machines were always the building that gave the most audacious technical solutions. The highlight was the Conttancin and built by Dutertre for the Paris Universal Exhibition of 1889, where a system of iron arches covered a huge area of 115 x 420 meters without any support to break the clearness of space. For the same exhibition in 1889 (year of the centenary of the French Revolution) was commissioned by the engineer Gustave Eiffel (1832-1923) to build a landmark momument to represent the triumph of technology in the modern world; what is the population of canada Eiffel was an expert in iron structures (bridge Douro in Porto, Garabit viaduct in France) and managed to raise a tower 300 meters high, the Eiffel Tower, which despite criticism for its time conservatives (those considered unworthy irons bustle of Paris) has become a symbol of the capital of France.
The city of Chicago is the birthplace of the rationalist and utilitarian architecture that dominate the world during the twentieth century. When in 1871 a fire destroyed much of the city, this was a phase of accelerated what is the population of canada growth as Chicago had become a major cereal market and a significant industrial center, supported by good rail and river communications.
This growth, along with the need to rebuild after the fire, led to an unprecedented boom in construction activity. It was necessary, however, what is the population of canada to solve some problems: speed of construction; what is the population of canada not to use wood to prevent new fires and building height for the rising sun. That was how the architects for the solution of these problems what is the population of canada in the techniques the builders of bridges and structures iron: iron can superimpose many flats and reduce construction problems and other structures; at the same time, the invention of the elevator and