Materials that used in US Capital building
Prepare a a speech draft editing on the below speech explaining on Materials that used in US Capital building.
So let me talk about Materials that used in US Capital building
First Architect is called William Thornton, and his design selected by George Washington in 1793, In the same year, George Washington laid the cornerstone but due to the challenges of having the materials and the skilled labor, so they choose to build capital use the brick clad in sandstone as a material of choice for both the inside and outside, they use the locally sourced to reduce the cost and it also give the ready availability during construction.
In 1796 they mainly focus on the north wing
And in 1811 the construction on the south wing finished
Later, during The war of 1812 with Great Britain, The British troops set on fire to the capital building, caused it badly damaged. Therefore, after the war, the engineer start to fix it, rebuild it, expand it..
And in 1826 Charles Bulfinch created the copper covered dome, but due to no one like the overall form, also the need of the space extension.
So, in the 1855. Thomas U. Walter decided to replace the old dorm.
Unlike the earliest dorm Pantheon, The engineer for the US capital dorm trying to rebuild it more taller, more fire proof, and durable. However, the more higher it goes, the more heavier it has, so the engineers found out a solution that is build second dorm based on the first dorm, the second dorm is a large thin shell dorm, and it held by a ring of 36 curved iron ribs rather than the heavy stone or concrete structure. So the second dorm made by the lightweight pre-fabricated cast-iron. It successfully hides the smaller self-supporting copper dome inside.
Okay, Let’s move to the top of the dorm,
There is a classical female figure called Statue of Freedom made by Thomas Crawford in 1863, the material used is bronze, if you look carefully, you will find Ten bronze points tipped with platinum are attached to her body to avoid the lightning strike.
Finally, Between 1884 and 1891, the marble terraces slowly added to North, West, and South sides of the Capital. And in 20th century, they used brick clad in marble to build the replica of the East Front.
