Patent for a new and improved auger. This design consists in "[t]he combination of a shank provided with a conveying-screw and the cutters at the lower end of the screw, the sides of the cutters being extended beyond a vertical line drawn across the edges of the screw, and a tube or casing enclosing the screw and connected at its lower end with the cutters, said tube being of less diameter than the cutters and arranged within the outer sides thereof" (lines 56-64).