50. Arrangement for Intermediate Floor. — Fig. 46 is a plan for the starting and landing of two flights connected by a 12-inch cylinder; such an arrangement is used where the short flight ascends to an intermediate floor on the platform level.
51. Quarter Platform With Tangent Between Quarter Cylinders. — 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.
52. Quarter Platform With Semicircular Cylinder.
Fig. 48 differs from the preceding plan only in the form of its