"# 623 View looking upstream from point near the
Government water intake on the Nevada side. The lower portals of Diversion Tunnels Nos. 2, 3 and 4 are shown. The bridge in the foreground, in addition to being a footbridge, carries a six-inch compressed air-pipe, gasoline pipe and water pipe. November 29th, 1931.
§ 622 Jack-hammer men drilling open cut excavation to lower portal of Diversion Tunnel No. 1. Note the hard-boiled hats, which are used by Six Companies Inc. employees, and which all men working in the canyon are required to wear. November 29th, 1931.
# 589 Drilling the first round in enlarging upper
portal of Diversion Tunnel No. 2. The welded steel ""Jumbo"" mounted on the truck has twenty-five air-drills on it. The Swing Shift crew is waiting to go to work. November 18th, 1931.
# 590 Looking downstream toward the damsite, from a
point near the upper portals of Diversion Tunnel No. 2. November 18th, 1931."
black and white photographs 4 x 5.3 in. or 8 x 4.8 in. paper background 10 x 13.5 in.
Archived TIFF images were scanned by Kathleen Broeder at 400 dpi with an Epson Expression 10000XL scanner. Digital images were reformatted in Photoshop. JPG and PDF files were then created for general use.