Fig. 47 is a plan of a quarter-platform stairway for a continued hand rail. The cylinder opening of 18 inches is formed by two quarter circles, each of 5 inches radius, and an 8-inch piece of straight stringer between. By this method a platform is secured, and angular winders are dispensed with; the run of the stairway is also reduced.

51 Quarter Platform With Tangent Between Quarter C 65

Fig. 47.