I appreciate drawings like this the way other people appreciate fine wines. (Large scale drawing here.) I can stare at them for a long time and inevitably I will start dreaming about making something similar.
Also, this sure looks like a clever contraption. Due to some nutty concept of ritual cleanliness I do not use a chain saw to obtain firewood, but this machine would pass my fundamentalist views on what is sylvian kosher and what is not.
But surely the blade would get stuck in the kerf? Saw a horizontal cut and the weight of the tree will normally pinch the blade until it can only be coaxed out with brute force and very foul language. I am skeptical about whether this device was ever used in the real world.
(Illustrations lifted from the always interesting notechmagazine.com.)