Trail:

Glossary

Bowed girder
A large beam with its top rising in an arch.
Bowstring bridge
A bridge with arches rising above the roadway which is suspended from them.
Bowtell
A term in use by the 15th century for a form of roll moulding, usually three-quarters of a circle in section (also called an edge roll).
Bow window
A projecting window of curved plan.
Box frame
Timber-framed construction in which vertical and horizontal members support the roof. Also concrete construction in which the loads are taken on cross-walls; also called cross-wall construction.
Box girder
A large beam of hollow-box section.
Box pew
Pew enclosed by a high wooden back and ends, the latter having doors.
Brace
Subsidiary member of a structural frame or roof. Bracing is often arranged in decorative patterns in timber-framed buildings. Arched braces: curved paired braces forming an arch, connecting wall or post below with tie-beam or collar beam above. Passing braces: long straight braces passing across other members of the truss. Scissor braces: paired braces crossing diagonally between pairs of rafters or principals. Wind-braces: short, usually curved braces connecting side purlins or ridge piece with principals.
Bracket
Small supporting piece of stone, etc., to carry a projecting horizontal member; hence also bracket-cornice.
Brattishing
Ornamental crest, often formed of leaves, flowers or miniature battlements, common in late medieval English architecture.

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