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United States Capitol dome
The United States Capitol features a dome situated above its rotunda. The dome is 288 feet (88 m) in height and 96 feet (29 m) in diameter. Designed by Thomas U. Walter, the fourth Architect of the Capitol, it was constructed between 1855 and 1866 at a cost of $1,047,291 (equivalent to $17.6 million in 2024). The Statue of Freedom tops the lantern on the dome, and the dome is centered over the origin on street maps of Washington, D.C.
The dome is not stone, but rather cast iron carefully painted to appear to be made of the same stone as the capitol building below. It is actually two domes, one inside the other, and the total weight is 9.1 million pounds (4,100 t). The dome's cast iron frame was supplied and constructed by the iron foundry Janes, Fowler, Kirtland & Co. in the Bronx, New York. The interior of the dome includes a detailed geometric and floral pattern of lightly colored plasterwork, with Constantino Brumidi's monumental ceiling fresco, The Apotheosis of Washington, appearing in the oculus at the top of the inner dome.
The origin of the first dome began with the Capitol design contest sponsored by Secretary of State Thomas Jefferson, at the behest of President George Washington, in 1792. The winner of the contest, Doctor William Thornton, called for a dome in his original design for the building. Most vividly, Thornton drew upon the Roman Pantheon for inspiration with the Neoclassical dome and associated portico.
Thornton's replacement, Benjamin Henry Latrobe, the second Architect of the Capitol, altered Thornton's design plan on the exterior by adding an octagonal drum to visually separate the bottom of the dome from the top of the building's pediment. The third Architect of the Capitol, Charles Bulfinch, altered the exterior profile of the plans still further by increasing the dome's height, which he later wrote was at the insistence of the President and Congress.
In 1822, Bulfinch requested funds for the construction of the center of the building, and President James Monroe signed off on an appropriation of $120,000. This included the building of a double-dome structure, a stone, brick, and wooden interior dome to rise 96 feet (29 m) above the rotunda floor (matching the dimensions of the Pantheon), and a wooden exterior dome covered in copper that would rise to 140 feet (43 m). Set at the crown of the exterior dome was an oculus 24 feet (7.3 m) wide, which provided illumination to the rotunda floor below. Bulfinch completed the project in 1823.
For more than two decades, the green copper dome of the Capitol greeted visitors to the nation's capital, until the 1850s. Due to the growth of the United States and the expansion and addition of new states, the size of the U.S. Congress had grown accordingly and pushed the limits of the capacity of the Capitol. Under the guidance of the fourth Architect of the Capitol, Thomas U. Walter, extensions were built onto the north and south wings of the building. In the process, the new, longer building made the original Bulfinch dome appear aesthetically displeasing (and it had in any case been the object of much prior criticism). Congress, after lobbying by Walter and Montgomery C. Meigs, then the supervising engineer, passed legislation to build a bigger dome in 1855.
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. Influenced by the great domes of Europe, Walter paid particular attention to the Pantheon of Paris, St Paul's Cathedral in London and St. Peter's Basilica in Rome, as well as the more recent Saint Isaac's Cathedral in Saint Petersburg, Russia, one of the first domes with an iron frame, by Auguste de Montferrand (1786–1858). William Allen, Historian of the Capitol, described Walter's first design as
... a tall, ellipsoidal dome standing on a two-story drum with a ring of forty columns forming a peristyle surrounding the lower half of the drum. The upper part of the drum was enriched with decorated pilasters upholding a bracketed attic. Crowning the composition was a statue standing on a slender, columned tholus ...
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United States Capitol dome
The United States Capitol features a dome situated above its rotunda. The dome is 288 feet (88 m) in height and 96 feet (29 m) in diameter. Designed by Thomas U. Walter, the fourth Architect of the Capitol, it was constructed between 1855 and 1866 at a cost of $1,047,291 (equivalent to $17.6 million in 2024). The Statue of Freedom tops the lantern on the dome, and the dome is centered over the origin on street maps of Washington, D.C.
The dome is not stone, but rather cast iron carefully painted to appear to be made of the same stone as the capitol building below. It is actually two domes, one inside the other, and the total weight is 9.1 million pounds (4,100 t). The dome's cast iron frame was supplied and constructed by the iron foundry Janes, Fowler, Kirtland & Co. in the Bronx, New York. The interior of the dome includes a detailed geometric and floral pattern of lightly colored plasterwork, with Constantino Brumidi's monumental ceiling fresco, The Apotheosis of Washington, appearing in the oculus at the top of the inner dome.
The origin of the first dome began with the Capitol design contest sponsored by Secretary of State Thomas Jefferson, at the behest of President George Washington, in 1792. The winner of the contest, Doctor William Thornton, called for a dome in his original design for the building. Most vividly, Thornton drew upon the Roman Pantheon for inspiration with the Neoclassical dome and associated portico.
Thornton's replacement, Benjamin Henry Latrobe, the second Architect of the Capitol, altered Thornton's design plan on the exterior by adding an octagonal drum to visually separate the bottom of the dome from the top of the building's pediment. The third Architect of the Capitol, Charles Bulfinch, altered the exterior profile of the plans still further by increasing the dome's height, which he later wrote was at the insistence of the President and Congress.
In 1822, Bulfinch requested funds for the construction of the center of the building, and President James Monroe signed off on an appropriation of $120,000. This included the building of a double-dome structure, a stone, brick, and wooden interior dome to rise 96 feet (29 m) above the rotunda floor (matching the dimensions of the Pantheon), and a wooden exterior dome covered in copper that would rise to 140 feet (43 m). Set at the crown of the exterior dome was an oculus 24 feet (7.3 m) wide, which provided illumination to the rotunda floor below. Bulfinch completed the project in 1823.
For more than two decades, the green copper dome of the Capitol greeted visitors to the nation's capital, until the 1850s. Due to the growth of the United States and the expansion and addition of new states, the size of the U.S. Congress had grown accordingly and pushed the limits of the capacity of the Capitol. Under the guidance of the fourth Architect of the Capitol, Thomas U. Walter, extensions were built onto the north and south wings of the building. In the process, the new, longer building made the original Bulfinch dome appear aesthetically displeasing (and it had in any case been the object of much prior criticism). Congress, after lobbying by Walter and Montgomery C. Meigs, then the supervising engineer, passed legislation to build a bigger dome in 1855.
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. Influenced by the great domes of Europe, Walter paid particular attention to the Pantheon of Paris, St Paul's Cathedral in London and St. Peter's Basilica in Rome, as well as the more recent Saint Isaac's Cathedral in Saint Petersburg, Russia, one of the first domes with an iron frame, by Auguste de Montferrand (1786–1858). William Allen, Historian of the Capitol, described Walter's first design as
... a tall, ellipsoidal dome standing on a two-story drum with a ring of forty columns forming a peristyle surrounding the lower half of the drum. The upper part of the drum was enriched with decorated pilasters upholding a bracketed attic. Crowning the composition was a statue standing on a slender, columned tholus ...
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