Hero of Alexandria
Hero (or Heron) of Alexandria (c. 10–c. 70) was a Greek engineer and geometer. His most famous invention was the first documented steam engine, the aeolipile. He is said to have been a follower of the Atomists. Some of his ideas were derived from the works of Ctesibius.
The complete surviving works are
- Pneumatica (Greek, c. 60),
- Automata (Greek),
- Mechanics (Arabic),
- Metrics (Arabic),
- Dioptra (Arabic).
Hero is credited with inventing many feedback control devices using water, fire and compressed air in various combinations, and the first type of analogue computer programming via intricate systems of geared spindles studded with pegs and wound with ropes connected to weights (trays of sand emptying over time) used to operate his automatic theaters that included automatic doors and multiple changing scenes of moving figures accompanied by lighting and sound effects.
- steam turbine (50/62/70) (aeolipile) - the first recorded steam engine, which was created almost two millenia before the industrial revolution, which was powered by steam engines. Apparently Hero's steam engine was taken to be no more than a toy, and thus its full potential not realized for quite some time.
- automatic temple doors - controlled by the temple priest lighting an altar outside of the temple, which heated water beneath it, which then moved counterweights which would open the doors. When the fire was extinguished, the water would cool and thus return the counterweights to their original position, which closed the temple doors.
- Coin operated Vending Machine - to vend holy water for temple worshipper to cleanse their hands
- Machine gun (which fired arrows), mechanical bow (which could fire arrows with great strength), and hand-powered catapult - these were designed but not realized because the needed materials were not yet available.
- water organ or hydraulic organ
- automated puppet theatres
- omen machine - temple patrons asked a simple yes or no question, and by descretion of the priest, the answer was yes or no depending on whether the mechanical bird sitting on the top of the box would sing and twirl or not
- water-powered mechanical birds - this was used in Hero's omen machine as well as entire flocks of mechanical birds. Realistic chirping sound effects also produced by a water device.
- compressed-air fountain
- siphons - this powered many of Hero's projects
- machine for threading wooden screws
- automated machine for moving full-scale theater set pieces
- density of air
- naval log, a variation of the odometer to be used at sea
- Webpage about Hero by The Technology Museum of Thessaloniki
- A translation of Pneumatica with diagrams
- Michael Lahanas's page
- Heron, and a translation of Pneumatica in German
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