Levers. Levers are one of the simple machines that were probably used in prehistoric times. Levers were first described about 260 BC by the ancient Greek mathematician Archimedes (287-212 BC). Levers.
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Trebuchet from The Romance of Alexander (circa 1330).
Trebuchet by Kolderer, c1507.
An early 14th Century trebuchet
A 13th Century "Mongol" trebuchet
A fixed-weight trebuchet from the early 16th Century