Jumbo rig with 30-40 jackhammers to make holes for blasting. Hoover (Boulder) Dam. Note on back: "Drilling jumbo designed by Woody Williams; 3 levels, built on truck chasses (sic), used for drilling. Drilled holes with 8 ft. drill, then 12', then 20'. - W. A. Davis, 1992."
Power shovel built by G.E. LeTourneau being unloaded from R.R. car before starting tunnel roads. Note on back: "Lowering bucket to put on new cables. According to Wint, LeTourneau never built a shovel. - James J. Hester, son-in-law of W. A. "Wint" Davis, 1992."
Black and white image of Hoover Dam with the following printed description: "View looking upstream in the Nevada turbine gallery. The runner for turbine N-2 has been placed and the wicket gates are about to be set." Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Government and Six Companies officials inspecting the Nevada spillway. Left to right: Norman S. Gallison, H. J. Lawler, Walker R. Young, Charles A. Shea, E. O. Wattis, Dr. Elwood Mead, Frank T. Crave, R. F. Walter and W. A. Bechtel. Site Name: Hoover Dam (dam)