A dictionary of architecture and building : biographical, historical, and descriptive . The arris formeil by the salientbetween two intersecting vaults. In the mostcommon form of vaulting with groins the vaultswhich intersect one another are simple barrelvaults, and each groin, beginning at the springin a solid angle usually of ninety degrees, in-creases in olituseness of angle as it ascends, and,where the vaults are of equal height, graduallypasses into nothing, the surfaces being practicallycontinuous at the crown of the vault. (SeeVault.) GROIN ARCH. A piece of arched con-struction fornnng
A dictionary of architecture and building : biographical, historical, and descriptive . The arris formeil by the salientbetween two intersecting vaults. In the mostcommon form of vaulting with groins the vaultswhich intersect one another are simple barrelvaults, and each groin, beginning at the springin a solid angle usually of ninety degrees, in-creases in olituseness of angle as it ascends, and,where the vaults are of equal height, graduallypasses into nothing, the surfaces being practicallycontinuous at the crown of the vault. (SeeVault.) GROIN ARCH. A piece of arched con-struction fornnng in some way the angle betweentwo simple vaults. Tlie term hiis no accuratesignificance, and is applied erroneously to the325 GSOOVB diagonal rib of a ribbed vault, and also to thewliole of a groined vault taken togctiier. Theonly sense in which it can be rightly used seemsto be in the series of larger and more carefullydressed stones laid as voussoirs in the angle be- tween intersectmg arcgroin is worked. GROINED VAULTING Groin Vault under Vault.) in which stones the (See Vault, and. Groin: Vaults with Groins; Dorsetshike, c. 1110. GROINING. Properly, the meeting ofsimple vaidts, such as barrel vaults, at an angleso as to form a more elaborate structure. (SeeGroin Vault, under Vault.) By extension, thebuilding of groined vaults generally. Underpitch Groining. The groining andalso the groined A-aulting resulting from theintersection of a larger and higher vault bysmaller ones. It is generally assumed that thelarger and the smaller vaults spring fromthe same plane and have the same, or nearlythe same, shape, viz., of semicircular section ; thesmaller vaults will then intersect the larger onebut will not reach above its haunches. ?Welsh Groining. Same as UnderpitchGroining. GROIN POINT. A groin in the strictsense gi^•(u al)i>\e ; a masons term to designatethe act\ial arris. GROIN RIB. The diagonal rili in a rililiedvault occupying tlie place where a groin mightbe constru
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