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The current cast iron dome of the United States Capitol is the second dome to sit above the building. Plans began in May 1854 to build a new cast-iron dome for the United States Capitol, sold on the aesthetics of a new dome, as well as the utility of a fire-proof one. [10]
The dome was 37 meters in diameter and used 51 cast iron ribs to converge on a wrought iron compression ring 11 meters wide containing a glass and wrought iron skylight. The outer surface of the dome was covered with copper, with additional windows cut near the dome's base to admit more light during an 1838 modification. [ 49 ]
The dome's cast-iron frame was made by the iron foundry Janes, Fowler, Kirtland & Co. [13] The 36 Corinthian columns designed by Walter, as well as 144 cast-iron structural pillars for the dome, were supplied by the Baltimore ironworks of Poole & Hunt. [14]
The most famous example is the United States Capitol dome, built 1855–66 and made entirely of cast iron. The dome was designed by the architect Thomas Ustick Walter, and fabricated by the New York iron foundry, Janes, Fowler, Kirtland & Co. The dome consists of nearly 9 million pounds of cast iron.
Cast iron gutters were introduced in the late 18th century as an alternative to lead. Cast iron enabled eaves gutters to be mass-produced: they were rigid and non-porous while lead could only be used as a liner within timber gutters. Installation was a single process and didn't require heat. [26] They could be attached directly to the fascia board.
He's calling the new effort "Iron Dome for America," drawing on a name for an Israeli system that protects the country from rockets and artillery. Trump is worried about far more severe threats ...