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.etc
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Hero of Alexandria
Greek Mathematician and Engineer
c. 10 – c. 70 AD
Derivation of Heron’s
Formula
Derivation of Heron’s
Formula
Derivation of Heron’s
Formula
Derivation of Heron’s
Formula
Heron’s Most
Famous Inventions
•
Aeolipile (First Recorded Steam Engine)
•
Fire-Activated Temple Doors
•
Heron’s Fountain
•
First Vending Machine
•
First Wind-Powered Organ
Aeolipile
First Recorded Steam Engine
- Water is heated up by
the fire, turns into
steam, and exits the
bent pipes, causing the
ball to turn
Amelia Carolina Sparavigna
Fire-Activated
Temple Doors
How it works
- The globe must first be
filled up halfway with
water
Amelia Carolina Sparavigna
Fire-Activated
Temple Doors
How it works
- When the fire is lit, the
pressure of air in the
altar and globe
increases
- The increased pressure
pushes the water into
the vessel
Amelia Carolina Sparavigna
Fire-Activated
Temple Doors
How it works
- The vessel full of water
pulls the chains down,
turning the hinges to
open the door
- The weight pulls the
door shut when the fire
is extinguished
Amelia Carolina Sparavigna
Heron’s Fountain
- Precondition: The
middle basin must be
filled up with water
- Powered by air
pressure
http://en.wikipedia.org/wiki/Heron's_fountain
Heron’s Fountain
- Precondition: The
middle basin must be
filled up with water
- Powered by air
pressure
http://en.wikipedia.org/wiki/Heron's_fountain
Other Inventions
Vending Machine
Wind Powered Organ
www.neatorama.
com
www.fineartamerica.
com
Other Inventions
Vending Machine
Wind Powered Organ
www.neatorama.
com
www.fineartamerica.
com
Advances in Optics
- Hero described a principle of reflection which
stated that a ray of light that goes from point A
to point B, suffering any number of reflections
on flat mirrors, in the same medium, has a
smaller path length than any nearby path
- This discovery led to
Fermat’s Principle which
led to Snell’s Law