The Huston Self-Leveling Berth

1881 Scientific American  
very ingenious, a shov,)l being caused to penetrate the earth, which it raises and delivers upon either side of the ditch at will of the operator. IMPROVED CLEVIS.
doi:10.1038/scientificamerican02191881-115a fatcat:bi6beau6nzd33pup6qf3esgrsu