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The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
[16]: 19 Alternating tread stairs can be designed to allow for a safe forward-facing descent of very steep stairs (however, designs with recessed treads or footholds do not have this feature). The treads are designed such that they alternate between treads for each foot: one step is wide on the left side; the next step is wide on the right side.
The nosing is the protrusion beyond the riser when vertical risers are used, or beyond the back of the tread below, when angled risers or no risers are used. Anti-slip strips or nosings may be applied. These stair parts can be manufactured from a variety of materials including aluminum, vinyl, and wood.
During the September 11 attacks, the stairs were an escape route for hundreds of evacuees from 5 World Trade Center, a 9-floor building adjacent to the Twin Towers. The staircase was moved from its original location in 2008, and in 2010 it became part of the National September 11 Memorial & Museum .
Billy Boat siping a sprint car tire. Fine slits are cut into the tire with a narrow blade, not near the size of a groove. [8] Racing tires are siped to increase speed. [8] The increased traction allows better contact to the racing surface for increased braking, acceleration, and turning. [8]
As tires are used, the tread is worn off, limiting its effectiveness in providing traction. A worn tire can often be retreaded. The word tread is often used casually to refer to the pattern of grooves molded into the rubber, but those grooves are correctly called the tread pattern, or simply the pattern. The grooves are not the tread, they are ...
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