Two or three students may work together on this problem.
Read all through before commencing work.
The stair and the hand-rail may be considered as one problem, since the
hand-rail forms part of the completed staircase, but they are separated
into two distinct problems for convenience in working them out.
In Fig. 121, is shown the plan and the elevation of the stair, the
dimensions for each piece required are calculated by the student from
this drawing. The name of each piece also is found in Fig. 121. The
nosing is to be added to the width of the tread. The nosing is the part
which projects beyond the front of the riser.
The thickness of the stringers is to be ½ inch, the risers ⅜ inches,
the treads ⅜ inches, and the well-hole is to be built up as in
practical work, as shown in Fig. 122.
[Illustration: FIG. 121.]