bn:00035088n
Noun Concept
Categories: Arches and vaults, Masonry
EN
flat arch  straight arch  jack arch  Jack arches
EN
An arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados WordNet 3.0
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EN
A jack arch is a structural element in masonry construction that provides support at openings in the masonry. Wikipedia
A form of arch in which the intrados is straight, but with its joints drawn radially. Wiktionary
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