keystone arch

keystone arch

Any arch having a keystone at its center, but commonly a flat arch or a round-topped arch.
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The finishing touches were made to the battlements on Thursday (February 28) and deputy head teacher, Mr Tim Lewis was particularly impressed by the use of the keystone arch.
BECKET- CHESTER- MIDDLEFIELD- REHABILITATION OF B-03-017=M-19-017 & B-03-018=M-19-018, OLD "WESTERN RAILROAD" KEYSTONE ARCH BRIDGES OVER THE WESTERN BRANCH OF WESTFIELD RIVER
3) This keystone arch at the Upper Barton Mill site once topped the channel that let water flow from the power wheel back to the French River.

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