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  2. Several factors made skyscrapers possible1234:
    1. The increase in urban commerce in the United States in the second half of the 19th century.
    2. The installation of the first safe passenger elevator in 1857, which allowed buildings to be taller.
    3. Technological advancements, including the Bessemer process for mass production of steel beams, the invention of the sprinkler head, and the use of AC electricity for elevators.
    4. The development of mass iron and steel production, which provided architects with new building materials.
    Learn more:
    The increase in urban commerce in the United States in the second half of the 19th century augmented the need for city business space, and the installation of the first safe passenger elevator (in the Haughwout Department Store, New York City) in 1857 made practical the erection of buildings more than four or five stories tall.
    www.britannica.com/technology/skyscraper

    The American technological revolution of 1880 to 1890 saw a burst of creativity that produced a wave of new inventions that helped architects to build higher than ever before: Bessemer steel, formed into I-sections in the new rolling mills enabled taller and more flexible frame design than the cast iron of the previous era; the newly-patented sprinkler head allowed buildings to escape the strict, 23-metre height limit, which...

    theconversation.com/a-short-history-of-tall-building…

    History of Skyscrapers

    • A skyscraper is a tall commercial building with an iron or steel framework.
    • They were made possible as a result of the Bessemer process of mass production of steel beams.
    www.thoughtco.com/how-skyscrapers-became-pos…
    The main technological advancement that made skyscrapers possible was the development of mass iron and steel production (see How Iron and Steel Work for details). New manufacturing processes made it possible to produce long beams of solid iron. Essentially, this gave architects a whole new set of building blocks to work with.
    science.howstuffworks.com/engineering/structural/…
     
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