Capsquare

In artillery, capsquares, or capsquires, are strong plates of iron which come over the trunnions of a cannon, keeping it in its carriage. They are fastened by hinges to the paizeplate, so that it could be lifted up and down. They form a part of an arch in the middle, to receive a third part of the thickness of the trunnions; for two thirds of them
Found on http://en.wikipedia.org/wiki/Capsquare

Capsquare

Cap'·square noun (Gun.) A metal covering plate which passes over the trunnions of a cannon, and holds it in place.
Found on http://www.encyclo.co.uk/webster/C/22

Capsquare

• (n.) A metal covering plate which passes over the trunnions of a cannon, and holds it in place.
Found on http://thinkexist.com/dictionary/meaning/capsquare/
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