Types of Stairs in Common Use.
In order to make the student familiar with types of stairs in general use at the present day, plans of a few of those most likely to be met with will now be given.
[Fig. 72] is a plan of a straight stair, with an ordinary cylinder at the top provided for a return rail on the landing. It also shows a stretch-out stringer at the starting.
[Fig. 73] is a plan of a stair with a landing and return steps.
[Fig. 74] is a plan of a stair with an acute angular landing and cylinder.
[Fig. 75] illustrates the same kind of stair as [Fig. 74], the angle, however, being obtuse.
[Fig. 76] exhibits a stair having a half-turn with two risers on landings.
[Fig. 77] is a plan of a quarter-space stair with four winders.
[Fig. 78] shows a stair similar to [Fig. 77], but with six winders.