NewScientist The Last Word - Tag 'riser' details

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Why are the risers on an escalator so much higher than on a standard staircase? The riser (the vertical part) of a normal household stairway is rarely more than 9 inches high. The riser of an escalator is generally around 12 inches. You'll notice this any time you have to walk up an escalator which has been turned off. Why are the risers so much taller?
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