Blocking course
Course of stones, or equivalent, on top of a cornice and crowning the wall.
Of concrete, with the impression of boards left by the temporary timber framing (formwork) used for casting.
(French): Panelling or other fitted interior woodwork with elaborate decoration of foliage, etc., used especially in the 17th- to 19th-century France.
Bolection moulding
A convex moulding covering the joint between two different planes, especially on panelling and fireplace surrounds of the late 17th and early 18th centuries.
West Walton, Norfolk.
The pattern of long sides (stretchers) and short ends (headers) produced by laying bricks in a particular way. English bond: with alternate courses of headers and stretchers exposed. English garden wall bond: with one course of headers for every three or more courses of stretchers. Flemish bond: with alternating stretchers and headers showing. Header bond: with only the headers exposed. Stack bond: non-structural brick facing in vertical (i.e. non-overlapping) tiers. Stretcher bond: with only the stretchers showing.
Knob or projection, e.g. at the intersection of ribs in a rib-vault.
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.
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.