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A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.
A drain cover is a cover with holes (e.g. a manhole) or a grating used to cover a drain, to prevent unwanted entry of foreign objects, or injury to people or animals. It allows drainage of liquids but prevents entry from large solid objects, and thus acts as a coarse filter. A sink drain cover is a drain cover used to cover the sink drain.
Employing a solid cover or grating that is flush with the surrounding surface, this drain is commonly made of concrete in-situ and with the option of using polymer- or metal-based liners or a channel former to aid in channel crafting and slope formation. The drain is characterized by its long length and narrow width, the cross-section of the ...
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Merry-Go-Round: A carousel is a type of amusement ride consisting of a rotating circular platform with seats for riders. The "seats" are traditionally in the form of rows of wooden horses or other animals mounted on posts, many of which are moved up and down by gears to simulate galloping, to the accompaniment of looped circus music. 1925 ...
A cone and seat are inside a pipe. Water flows through an annular gap between the pipe and cone when it is moved downstream, away from the seat. Ribs support the bulb assembly and supply air for water jet stabilization. Ring jet valves are similar to fixed cone valves, but have an integral collar that discharges water in a narrow stream. They ...
The rider — who anonymously spoke to local Phoenix, Ariz. news — was captured on video leaping from the park's Desert Storm roller coaster on Sunday, after he claimed to have heard a clicking ...
Now with a company to manufacture the track, B&M built its first roller coaster, a stand-up roller coaster, Iron Wolf, which opened in 1990 at Six Flags Great America. [ 8 ] [ 9 ] Two years later, Bolliger & Mabillard built another project for Six Flags Great America, Batman: The Ride , the world's first inverted roller coaster , which brought ...
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