MARCH of HISTORY by Richard Wall
Thursday, October 14, 2010
The Keystone-Key to the Arch
The keystone-one of the greatest architectural discoveries of history.
A keystone is the architectural piece at the top of an arch. The keystone, using the pull of gravity, locks the other pieces of the arch into position.
It Can be a simple block or an elaborate decorative piece, either way it is the key to the strength of the arch design.
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