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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.
Freeze-Frame is the tenth studio album by American rock band the J. Geils Band, and the last one to feature original vocalist Peter Wolf. The album was released on October 26, 1981, by EMI Records . It reached number one on the United States Billboard 200 album chart in February 1982, and remained at the top for four weeks.
The ductile iron used to manufacture the pipe is characterized by the spheroidal or nodular nature of the graphite within the iron. [2] Typically, the pipe is manufactured using centrifugal casting in metal or resin lined moulds. [3]
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A mortar today is usually a simple, lightweight, man-portable, muzzle-loaded cannon, consisting of a smooth-bore (although some models use a rifled barrel) metal tube fixed to a base plate (to spread out the recoil) with a lightweight bipod mount and a sight.
French soldiers in the Franco-Prussian War 1870–71 British 64 Pounder Rifled Muzzle-Loaded (RML) Gun on a Moncrieff disappearing mount, at Scaur Hill Fort, Bermuda. This is a part of a fixed battery, meant to protect against over-land attack and to serve as coastal artillery.