A crane system needed to construct the Hoover Dam bypass bridge across Black Canyon should be up and running this month, a federal official said. The new pulley-type, "high-line" crane system was ...
Understand How a Crane Works Before you start building, it is important to know how a crane functions. A crane uses a ...
The Ancient Greeks may have invented an intricate pulley system of ropes and levers to lift vast blocks weighing up to 900 lbs when building their enormous structures. In the sixth century BC, the ...
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