P. Merriam and A. B. Darling, of North Adams. Mass., hsve taken measures to secure a patent for packing piston heads, stuffing bo-t-es, !. India rubber or other elastic material is placed between the body of the piston head, and metallic rings. A sell-adjusting piston of equal radial pressure is thus produced. By reversing the position of the india rubber, a perfectly tight stuffing box is obtained. The india rubber being used as an intermediate, by properly adjusting it an equal radial pressure will be created, and may be used for pistons, bellows, blowing cylinders, and pumps.