Construction
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    The Capitol has a complicated history. Many architects and builders contributed to the present building. America's first President,  George Washington, did lay the cornerstone for the Capitol. Here is a brief outline of the other main contributors and their accomplishments.

 

An old Capitol blue print

These are the blueprints of the original designs of the Capitol.

blueprint

Another drawing

 

Date

Architect/Builder

Accomplishment

1797 William Thornton William Thornton designed the original layout of the Capitol building, which was chosen by George Washington and Thomas Jefferson.  His design included two domed spaces, an elliptical colonnade, an oval staircase, and much more.
1803 (Campaign 1) Benjamin Henry Latrobe Benjamin Henry Latrobe was hired to resume construction in 1803.  He was suppose to build according to Thornton's design, however, he found the design to be faulty so he redesigned and rebuilt many rooms and aspects in the Capitol such as a single, saucer dome instead of two.
1815 (Campaign 2, after the War of 1812) Benjamin Henry Latrobe During this campaign, Benjamin Henry Latrobe rebuilt the rooms damaged by the British when they took over the Capito. He continued to design and build until his death in 1817. He did leave a  collection of drawings for the completion of the Capitol.
1818 Charles Bulfinch Charles Bulfinch was hired to finish building the Capitol.   He executed Latrobe's design but also added in his own design.  He did complete the Capitol in 1829, however, office space and the size of the legislative chambers were too small.
1851 Thomas U. Walter Thomas U. Walter's designs to extend the Capitol building with expansions were approved by President Millard Fillmore. 
1853 Montgomery C. Meigs Montgomery C. Meigs was given control to complete the expansions. He placed the chambers for the House of Representatives and the Senate in   the new wings which were built.

Since the completion of the Capitol, there have been many renovations to the Capitol building.  

The following pictures are models of the Capitol during construction:

An original model

This model shows the design for the Capitol that was completed in 1797 by William Thornton.  It was the original design for the Capitol of the United States of America. 

Another Capitol model

Yet another model

This model represents the Capitol construction as designed by Benjamin Henry Latrobe, which was completed in 1829.  A front view of an older model

A complete model

This model shows the revised elevation of the dome of the Capitol in 1846.

A front view of model

  

Bibliography:

1. Scott, Pamela, Lee, Antoinette J., Society of Architectural Historians: Buildings of the United States: Buildings of the District of Columbia, New York, Oxford, Oxford University Press, 1993