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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
