History
An early cam was built into Hellenistic water-driven automata from the 3rd century BC. The use of cams was later employed by Al-Jazari who employed them in his own automata. The cam and camshaft appeared in European mechanisms from the 14th century.
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“We aspire to be something more than stupid and timid chattels, pretending to read history and our Bibles, but desecrating every house and every day we breathe in.”
—Henry David Thoreau (1817–1862)
“What is most interesting and valuable in it, however, is not the materials for the history of Pontiac, or Braddock, or the Northwest, which it furnishes; not the annals of the country, but the natural facts, or perennials, which are ever without date. When out of history the truth shall be extracted, it will have shed its dates like withered leaves.”
—Henry David Thoreau (1817–1862)