A hammer is a tool meant to deliver an impact to an object.
The most common uses are for driving nails, fitting parts, forging metal and
breaking up objects. Hammers are often designed for a specific purpose, and
vary widely in their shape and structure. The usual features are a handle and a
head, with most of the weight in the head.
The basic design is hand-operated, but there are also many
mechanically operated models for heavier uses, such as steam hammers. The
hammer may be the oldest tool for which definite evidence exists. Stone hammers
are known which are dated to 2,600,000 BCE. The hammer is a basic tool of many
professions. By analogy, the name hammer has also been used for devices that
are designed to deliver blows, e.g. in the caplock mechanism of firearms.
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