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A "squared helical" stair fills a square stairwell and expands the steps and railing to a square, resulting in unequal steps (wider and longer where they extend into a corner of the square). A "pure helix" fills a circular stairwell, and has multiple steps and handrail elements which are identical and positioned screw-symmetrically.
A handrail is a rail that is designed to be grasped by the hand so as to provide safety or support. [1] In Britain , handrails are referred to as banisters . Handrails are commonly used while ascending or descending stairways and escalators in order to prevent injurious falls, and to provide bodily support in bathrooms or similar areas.
NASA managers met on June 14, 2009, and June 15, 2009, and evaluated the leak, discussed steps that had to be taken, and set a new launch date of June 17, 2009, at 05:40 EDT. [7] [8] A second launch attempt was made on June 17, 2009, for which NASA moved the planned launch of the Lunar Reconnaissance Orbiter to a new date. On June 17, 2009 ...
It can also refer to an upright post that supports and/or terminates the handrail of a stair banister (the "newel post"). [ 1 ] [ 2 ] [ 3 ] In stairs having straight flights it is the principal post at the foot of the staircase, but the term can also be used for the intermediate posts on landings and at the top of a staircase.
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