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Very interesting Clinton, thanks for sharing. I have actually never seen one before.
The one I remember in my youth driving steel sheet piles was a much simpler device that sat on top of the pile and went bang bang bang bang bang bang rather like a machine gun. Ran off a big vertical boiler via a flexible hose. I'd forgotten all about it till I saw your post.
My meccano version is more conventional It winds a weight up and drops it over a fairly slow cycle. Driven by an SE4.
St. Paul steam
very interesting...she was hitting the post mightily...but i didn't see the post moving much....