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During the Pascal-B nuclear test of August 1957, [8] [9] a 900-kilogram (2,000 lb) iron lid was welded over the borehole to contain the nuclear blast, despite Brownlee predicting that it would not work. [8] When Pascal-B was detonated, the blast went straight up the test shaft, launching the cap into the atmosphere. The plate was never found. [10]
A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...
Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...
Neenah Foundry; Company type: Private; Subsidiary: Industry: Foundry: Founded: 1872, 153 years ago: Headquarters: 2121 Brooks Avenue Neenah, Wisconsin, U.S.: Products: Cast iron infrastructure solutions (manhole frames and covers, inlet frames and grates, trench frames and grates, airport products, bridge drainage, tree grates, detectable warning products, downspout boots, access and hatch ...
This page was last edited on 5 December 2024, at 18:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
A round manhole cover cannot fall down the hole because the lip (under the manhole that the cover sits on) is smaller than the cover thus the cover cannot ever fall into the hole. A square or rectangular cover (like a storm drain cover) has the same lip that the cover sits on but it is fairly easy for a cover in the shape other than a round ...
A Butterworth cover (also Butterworth hatch and Butterworth plate) is a hatch on the deck of a cargo vessel that is used to seal a small opening that admits to the space below. [ 1 ] [ 2 ]
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