One brick wall

Episode of Series “Brickwork”. Construction of one brick return angle. Use of two lines in walls more than one brick in thickness. Treatment at corners, toothing, racking back. Datum pegs and gauge rod. Laying of damp-proof courses, slates and bituminous felt. String and zinc tingles. Blacking out lines for piers. Protection of air brick by slate or Welsh arch. Construction of Welsh arch.