Workmen making up sections of the vaulted roof. When the steel skeleton is completed, it is swung into position on the foundation by a gigantic crane. Each section is about 12 feet wide and 112 feet across. When in position, concrete is poured forming a solid roof

While construction is underway, the uncompleted sections of the roof must be mobile in order that a perfect fit may be made. Steel rails are laid and the sections of roof mounted upon them, allowing the giant pieces to be moved by a small crew with block and tackle

Swinging a form for the concrete high speed basin into place. The workmen are standing in the place where the unique concrete hinges of the arched roof will be

Work on Mellon's gift to National Capitol progressing rapidly. Washington, D.C., Nov. 3. Construction of the new National Gallery of Art, a gift of the late Andrew Mellon to the United Stated Government, is progressing rapidly. The building, which is expected to be the most beautiful and one of the

Construction on new Federal Reserve building

Construction at building

Production. Magnesium.

U.S. to have world's greatest ship-testing basin. Carderock, MD., March 21. Work is rapidly going forward on the new U.S. Navy ship- testing basin now under construction here. It will be the largest ship-testng basin in the world and will have cost three million dollars when completed, 3/21/38

"Boulder Dam, detail of panel construction in overflow weir of Nevada spillway."