Image: HooverDamJumboRig
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HooverDamJumboRig.jpg (770 × 557 pixels, file size: 134 KB, MIME type: image/jpeg)
Description: This piece of equipment, named a Jumbo Rig, was designed to speed up the Hoover Dam's tunnel drilling process. Built on the back of a 10-ton truck, 24 to 30 drills could be operated at once.
Title: HooverDamJumboRig
Credit: http://www.usbr.gov/lc/hooverdam/images/jumbo.jpg
Author: Bureau of Reclamation
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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