Hammer
A tool consisting of an iron head fixed crosswise upon a handle. The hammers in common use are of different kinds: including the heaviest sledge, wielded by both hands, with which a very heavy blow may be given; the hand-hammer, which may be used with one hand; and intermediate sizes and shapes for a variety of uses. The largest hammers are those used in the iron manufactories for forging purposes, being machines moved by steam or some other power, the chief of which will be described under their respective heads. See STEAM-HAMMER; TILT-HAMMER.