Gears

Did you know?... The earliest written reference to gears was by Hero of Alexandria in AD 50. He invented a machine called a “baroulkos” which used a sequence of gears to lift weights.

In fact the use of gears is more likely to have begun in during studies of mechanics in the Greek Alexandrian school in the 3rd century BC. Inventions using gears were also developed by the Greek engineer and mathematician Archimedes in the 1st century BC.