This section is from the book "A Treatise On Architecture And Building Construction Vol3: Stair Building, Ornamental Ironwork, Roofing, Sheet-Metal Work, Electric-Light Wiring And Bellwork", by The Colliery Engineer Co.. Also available from Amazon: A Treatise On Architecture And Building Construction.
41. In Fig. 33 are shown the plan (a) and elevation (b) of a straight stairway, with a single newel set diagonally at the landing, the stringer facia and hand rail being curved to enter two adjacent faces of the newel. In the plan, a b c d is the position of the carriage timber; A and B indicate the position of the floorbeams. Half balusters are set against the sides of the newel to which the hand rails are connected. In the elevation, a' b' c' d' show the depth and position of the carriage timbers, and A is the landing floorbeam. Draw s' e' h' in the elevation equal to the arc o c h on the plan; through h' and c' erect perpendiculars for the sides of the newel; through c' draw c' j parallel to the face of the newel; lay off's' t' equal to s t in the plan; parallel to s"j draw t' i; draw i z parallel to the tread, then j i z is the center line of the rail. This fixes the height of the flight rail at the newel; the level rail is 2 ft. 6 in. above the floor.