In small blasts, 1 pound of powder will loosen about 4½ tons.

In large blasts, 1 pound of powder will loosen about 2¾ tons.

60 or 60 pounds of powder, enclosed in a resisting bag, hung or propped up against a gate or barrier, will demolish any ordinary construction.

One man can bore, with a bit 1 inch in diameter, from 60 to 100 inches per day of 10 hours in granite, or 300 to 400 inches per day in limestone.

Two strikers and a bolder can bore, with a bit 2 inches in diameter, 10 feet in a day in rock of medium hardness.