They are provided when the direction of flight has to be changed by 90°. The change in direction can be effected either by introducing a landing at a quarter space or by providing a winder at the junctions.
Stair’s which are quarter turn
They are provided when the direction of flight has to be changed by 90°. The change in direction can be effected either by introducing a landing at a quarter space or by providing a winder at the junctions.
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