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Oculus A round opening, often glazed, as a window, but sometimes blind. Related Words Blind (of arcades etc) Ogee gutter A cast-iron gutter, one side of which has an ogee profile. The base and the other side, are flat, and the base sits on top of a wallhead. Related Words Cast iron work; Gutter ; Rhone; Wallhead Ogee, ogival A double curve, bending first one way, then the other, on either side of a vertical line.     Open joints A term used of masonry or brickwork where the mortar between stones or bricks has eroded. Open joints are a very common reason for water penetration. Related Words Brick; Masonry; Mortar Organ chamber A space, often built on to a chancel area, to accommodate a pipe organ, and often apsidal in form. Organ chambers can also be formed within the envelope of a conventional worship space. Related Words Apse, apsidal Outriggers A name given to the exposed ends of rafters and purlins, projecting beyond the wallheads in a building with oversailing eaves. Also referred to as 'sprockets'. Related Words Eaves, eaves band; Oversailing eaves; Rafter Oversailing eaves A term used to describe the overhangs in a building in which the roof overhangs the walls. It may simply overhang at the sides, or at the sides and ends.