A shot in the dark, but was kinda hoping someone here might recall Emerson from Lamoni Iowa and if his patent was ever made commercially or got to try one out.
I spent some time looking at the drawings and reading the description. Frankly, I am not sure exactly if that one would work. There are no teeth on the 'shims' to hold them in the kerf. Do you suppose that friction between the shims and the wood would be enough to force the wedge in when the jack was pumped? Assuming that nothing broke (hate to see those chains snap!), I would expect the shims to be pulled out first. Maybe he might do better with a chain around the tree, with a Humbolt cut?
Philbert