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June 1942. "Tennessee Valley Authority -- construction cranes at Douglas Dam." Kodachrome transparency by Alfred Palmer. View full size.
Here is a mid-sized Clyde, still working full time.
Reportedly, this one was originally steam, as were most of the barge-mounted Clyde derricks. US Corps of Engineers has several former steam Clydes, smaller than this one, on the Great Lakes.
A few years ago, I watched the 2 big dock cranes at Superior (Duluth) WI, using a spreader bar to buddy lift windmill generators that were too heavy for either crane alone.
Some of the largest floating cranes, many times this size, but still recognizable as Clyde design, were built by Clyde's successor, Amclyde. These are all ocean based, and there are a lot of them out there.
These cranes were manufactured to exclusive design by Clyde Iron Works in Duluth, MN. The company is gone but several cranes are still around including two at the Port of Duluth.
They could have been the beginning of AT-ATs.
The dam was built to provide power to Oak Ridge for the Manhattan Project, whose factories produced the materials used in the atomic bomb. Astonishingly built in only 13 months.
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