The automatic opening of the temple gates after sacrifice had taken place on its altar (the first automatization in building worldwide)

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The automatic opening of the temple gates
after sacrifice had taken place on its altar
(the first automatization in building worldwide)


Reconstruction of the invention of Heron of Alexandria, which permitted the automatic opening of the temple gates after the sacrifice on its altar.

The altar-fire warmed the air inside the container underneath and due to the expansion of gases, the air pressed the water to another communicating vessel. Through a siphon , the water was carried to a container on a balance and caused the inclination of the balance towards the container. This inclination in turn caused the rotation of the two gate axles and thus opening them. After the sacrifice, when the air underneath the altar cooled, the reverse motion of the water through the siphon caused the balance to return to its original position and thus causing the gates to close.

SOURCES: ''Heron, Pneumatics, Α 38''