From armament making to machine tools. (includes related article on George H. Corliss, Joseph R. Brown and Francis A. Pratt)

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The American a whole of manufacturing based on interchangeable parts
had been unfolded by arms makers. In the proces they had to lay open
and build machines that would give them the precision they exigencyed
None of them musing of themselves as machine-tool builders. They
were in the business of making arms, and they built the machines they
need for that object

In the mid-1800s, there began to come up firms whose main purpose was
the disclosure and building of machine tools. a certain number of like William
Sellers, began with that aim in mind. Others, like Brown &