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{{B}} Automatic Doors in Egypt{{/B}}
When you next step through the doors of a supermarket, spare a thought for Heron, a talented specialist of ancient "high tech" engineering. Nearly two thousand years ago he designed automatically opening doors for the temples of the Egyptian city of Alexandria.
Heron had a talent for designing mechanical wonders to surprise people and make people happy.{{U}} (46) {{/U}}was a gift to the Egyptian priests, who for centuries had used wonder mechanical or otherwise, as a way of strengthening their authority.
Employing relatively simple mechanical principles, Heron devised a means{{U}} (47) {{/U}}as if by unseen hands—when the priest lit a fire on the altar outside the temple. The fire heated the air in a metal globe placed beneath the altar, foreign the water in it through a pipe into an enormous bucke

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