It is a catenary, as defined by the following mathematical equations:
y = cosh(x)
or
y = (e^x + e^-x)/2
A catenary is the shape which a flexible linear object with constant mass will naturally hang in when it's endpoints are fixed. The classic example is a cable or a chain. Catenary's have a practical application in arch construction because the force of the weight of the higher portions of the arch is always directed into the lower portions of the arch, making it very self supporting. This is why the Arch is constructed as a catenary, and why it is still standing.
The Arch in St. Louis is at 200 Washington Ave, Gateway Arch, St. Louis,
The St. Louis Arch
St. Louis ARCH symbolizationThe St. Louis arch symbolizes the gateway to the west. In the late 1800's and early 1900's, St. Louis was considered the west. Builders constructed the arch to symbolize St. Louis as the city of the west. back then, it was known as St. Louis being the west; the territory beyond was being explored by Louis and Clark at the time the arch was built. It took over 2 years to construct the arch, or otherwise called, the St. Louis Gateway.
The St. Louis artch was built in St. Louis
Construction on the Gateway Arch in St. Louis was completed in 1965.
Downtown St. Louis
St. Louis You would find the Gateway Arch in St. Louis.
Just the St. Louis Arch. sometimes referred to as The Gateway to The West
The St. Louis artch was built in St. Louis
The Gateway Arch in St Louis
Gateway to the West. jkernan
in St Louis