Beef-splitting saw. 0:47 video:
https://www.youtube.com/watch?v=ArUKZWkXQ9M
Previously:
https://www.homemadetools.net/forum/...912#post100291
https://www.homemadetools.net/forum/...324#post101294
https://www.homemadetools.net/forum/...175#post138382