Black and white image of workers placing concrete in column H-5 between elevation 630 and elevation 635 during the test pour made before the Hoover Dam Board of Consulting Engineers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of "Big Bertha," the Six Companies, Inc. motor transport used to haul workmen between Boulder City and Hoover Dam. This double-decker truck could haul 154 men. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam under construction. This view is looking down into the upper cofferdam area from the rim of the Arizona side of Black Canyon. Also visible are a temporary earth diversion dam and steel sheet piling extending out from the Nevada abutment and marking the upstream toe of the cofferdam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of "Big Bertha" with the following printed description: Six Companies, Inc. motor transport hauling workmen between Boulder City and the dam. This double decked truck hauls 154 men.
Black and white image of three employees from the Stenographic Office at the Bureau of Reclamation with the following printed description: "Left to right: Hannah Houn, Stenographer; Cecile M. Dotson, Mails and File Clerk; Rose V. Crippa, Stenographer."
Black and white image of fire fighters with the following printed description: "Government fire fighting equipment, Boulder City. The driver of the truck is Robert Hewes in charge of fire detail."