Treads, 1¼ inch thick. Project over risers, 1¼ inch.
Risers, 1 inch thick.
Scotia, 1¼ inch by ⅝ inch.
Strings, 1½ inch.
PLATE 4.
PLATE IV.
PLAN AND ELEVATION OF OPEN NEWEL STAIRCASE, WITH SPANDRIL UNDER BOTTOM FLIGHT.
Fig. 1 shows the plan of an open newelled stairs, starting from a bull-nose step at bottom, and having a short piece of rail along the top to give sufficient headroom. The dotted lines show the joist.
Fig. 2 shows the elevation, with spandril and newels. After having taken the width, height and going or run on to the rods, set up an elevation to 1½ scale, when the size of strings can be taken off; newels, length of rails and spandril can all be set out. Draw the line H H parallel to the line of nosing and 7 feet above. Keep the bottom of facia crossing over the bottom flight above this line. After having set out the stairs to this scale mark off the rods full size.