Film strip of Boulder City or Hoover Dam construction, image 012: photographic print

This photograph has three images. The first one (0272_0056) reads, "See the river behind the dam. A heavy flow storming upriver, slot in middle of dam has gauges installed along to register heat generated by this pile of cement. Pipe strung along bottom of each pour on each level of the dam, ends in the slot. Each pipe at each level will be pumped with refrigerated water until each level has been cooled. Then the pipes will be pumped full of cement. They will then fill that 5 ft. height. If not cooled, would generate enough heat to explode." The second one (0272_0057) is upside-down, and it reads, "#8 hi-line with doors open; line is slack on doors. This line is called, by bell boy to operator, the load line. When full of mud this line carries the load. No.8 is now using single line, makes it faster and quieter." The third image (0272_0058) reads "No.8 and No.7 working off hi-trussel." The top arrow: hook tender, bottom arrow: donkey operator and his donkey - run by electricity." It also says, "No.8 using 4 yd. bucket to pour small forms on the face of the dam. Some forms become quite small as the slant of the dam shortens them at each height."