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Tunnel progress at Parker Dam aided by large drill jumbo
Jumbo with working platforms at three levels and mountings for 19 drills facilitating progress in twin diversion tunnels of 32-ft diam, driven around Parker Dam site on Colorado River.
Tunnel progress at Parker Dam aided by large drill jumbo
Jumbo with working platforms at three levels and mountings for 19 drills facilitating progress in twin diversion tunnels of 32-ft diam, driven around Parker Dam site on Colorado River.
Tunnel progress at Parker Dam aided by large drill jumbo
Eng News-Rec
Engineering News-Record ; 116
1936
2 pages
Article (Journal)
English
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