Thomas Ustick Walter

Thomas Ustick Walter: The Dome Built During a Civil War

In December 1863, with the Union armies still in the field and the outcome of the war undecided, workmen hoisted the Statue of Freedom onto a cast-iron dome rising above the United States Capitol. The structure had been authorised in 1855, would take until 1866 to finish, and cost $1,047,291. The man who designed it had started his working life carrying bricks for his father.

A Bricklayer's Apprenticeship

Thomas Ustick Walter was born in Philadelphia on 4 September 1804. He showed early aptitude for mathematics and drawing, but his first experience of construction was physical: he worked as a bricklayer for his father during the building of the Second Bank of the United States, William Strickland's Greek Revival masterpiece on Chestnut Street. Few architects have learned their trade quite so literally from the ground up, and the habit of thinking about how a building actually goes together — rather than merely how it looks in elevation — never left him.

He then studied architecture properly, in Strickland's own office, and attended the School of Mechanic Arts at the Franklin Institute under the instruction of John Haviland. Two of the leading American architects of the era thus had a hand in his training, and Walter emerged fluent in the classical vocabulary that dominated the young republic's public building.

Philadelphia

He established his practice in 1830. Moyamensing Prison followed in 1832–35, but the commission that made him was Girard College. The Philadelphia City Council accepted his design in 1833, and he supervised the construction until 1847 — fourteen years on a single project, culminating in Founder's Hall, a Corinthian temple of white marble that remains among the most ambitious Greek Revival buildings in the United States. In 1838 the college paid for a European study tour, and Walter travelled through England, Ireland, France and Italy examining educational architecture, one of the relatively few American architects of his generation to see the originals rather than the engravings.

He was also, unusually for an architect, an engineer of infrastructure. Between 1843 and 1845 he designed and completed a breakwater for the port of La Guaira in Venezuela — a marine engineering commission on the Caribbean coast, executed by a man best known for temples.

Washington

In 1851 President Millard Fillmore approved Walter's plans for the enlargement of the U.S. Capitol and appointed him Architect of the Capitol Extension. He took office on 11 June. The building he inherited was too small for a nation that had doubled in size, and the task was to add new marble wings north and south to house an expanded Senate and House.

The administrative history of the project is a study in confusion. Walter's office began under the Department of the Interior, then from 1853 to 1862 was placed under the War Department, where his work was overseen by the army engineers Montgomery C. Meigs and William B. Franklin. In 1862, in the middle of the war, it reverted to Interior. He also rebuilt the west centre building housing the Library of Congress after the fire of 1851 — the first American library interior to be constructed largely of iron, and a rehearsal for what came next.

The Dome

The original Capitol dome had been designed for a smaller building. Once Walter's wings were in place, it looked absurd — a modest cap on a vastly extended base. His answer, authorised by Congress in 1855, was a new dome of cast iron: fireproof, far lighter than masonry of comparable size, and assembled from prefabricated segments that could be cast off-site and bolted into place.

This was the decisive move of his career and it was an engineering decision as much as an aesthetic one. A masonry dome of the required height would have imposed loads the existing structure could not carry. Cast iron let him build tall and slender, with an inner and outer shell, and produce a silhouette that reads as monumental stone while weighing a fraction of it. Construction ran from 1856 to 1866, straddling secession, four years of war and the assassination of a president. The Statue of Freedom went up in December 1863.

Walter resigned on 26 May 1865, after fourteen years, with the dome not quite complete.

The Profession

He was one of the founders of the American Institute of Architects, the body that turned architecture in the United States from a trade into a profession, and he served as its president from 1876 until his death. His own circumstances were less orderly. He briefly retired after leaving Washington, but financial difficulties forced him back to work, and from 1873 until the end of his life he served as chief assistant to the architect of Philadelphia City Hall — the designer of the nation's most recognisable dome finishing his career as somebody else's deputy.

Why Thomas Is Called a Genius

The claim rests on structural imagination rather than pure design invention, and it is worth being precise about that. Walter's classical vocabulary was inherited from Strickland and Haviland and, beyond them, from Europe; Founder's Hall is a superb Greek Revival building but it is not a new idea. What was new was his answer to the Capitol problem: recognising that the constraint was weight, not style, and reaching for cast iron — an industrial material — to produce a form the eye reads as classical stone. That is a genuinely original synthesis, executed at enormous scale, on an unforgiving site, under three different government departments, through a civil war. The Architect of the Capitol's own history credits him with fundamentally transforming the nation's most important building at a critical moment in its history.

The counter-case is that much of the work was collaborative and contested. Montgomery Meigs, the army engineer who supervised him for nine years, was himself a formidable constructor, and the credit for the Capitol extension has never been cleanly divisible. Walter designed no new architectural language and founded no school of design; his influence runs through the AIA and through one building rather than through a body of theory. And the shape of his later life — forced back to work by money trouble, assisting on another man's city hall — suggests a superb professional rather than a commanding artistic figure. What he did have was the engineer's willingness to solve the problem with whatever material would actually work.

Legacy

Walter died on 30 October 1887, aged eighty-three. The dome he designed has since become the most reproduced silhouette in American public life — the shorthand for the republic itself, stamped on currency, letterheads and the establishing shot of every film about Washington. It is a nineteenth-century industrial artefact, bolted together from iron castings, doing the work of a Roman monument. Its designer began by carrying bricks.

Achievements

• Notable work: Moyamensing Prison
• Fellow of the American Institute of Architects
• Movement: Greek Revival architecture