[Answer] Which of these is a moving staircase?

Step 1 : Introduction to the question " Which of these is a moving staircase? "

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An escalator is a moving staircase which carries people between floors of a building or structure. It consists of a motor-driven chain of individually linked steps on a track which cycle on a pair of tracks which keep the step tread horizontal.

Escalators are often used around the world in places where lifts would be impractical, or they can be used in conjunction with them.

Escalators typically rise at an angle of 30 or 35 degrees from the ground. They move at 0.3–0.6 metres per second (1–2 ft/s) – like moving walkways – and may traverse vertical distances in excess of 18 metres (60 ft). Most modern escalators have single-piece aluminum or stainless steel steps that move on a system of tracks in a continuous loop.

Nathan Ames, a patent attorney from Saugus, Massachusetts, is credited with patenting the first "escalator" in 1859, despite the fact that no working model of his design was ever built. His invention, the "revolving stairs", is largely speculative and the patent specifications indicate that he had no preference for materials or potential use (he noted that steps could be upholstered or made of wood, and suggested that the units might benefit the infirm within a household use). The suggested motive power was either manual or hydraulic.

More Info: en.wikipedia.org

Step 2 : Answer to the question " Which of these is a moving staircase? "

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