For subsequent layers, penetrate the previous layers about 1 inch. For 6 by 12 inch molds use a 5/8 inch diameter tamping rod and a 3/8 inch diameter rod for 4 by 8 inch molds. 4. Lightly tap the ...
The three-foot, seven-inch, thirteen-and-a-half-pound tamping iron flew into Gage's head, injuring his left eye and damaging his skull and optic nerve. His skull and the metal rod were later kept ...