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December 1 – In Winchester, Massachusetts, a lighted match dropped into a sewer manhole by an employee of the Arlington gaslight company set off an explosion which injured five gas line repairmen and blew the steel manhole cover 30 feet into the air. The gas ignited along the sewer line into Rangeley, where two more manhole covers were blown ...
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.
Automobile tire damaged after an impact. A blowout (also known as a burst) is a rapid, explosive loss of inflation pressure of a pneumatic tire.. The primary cause for a blowout is encountering an object that cuts or tears the structural components of the tire to the point where the structure is incapable of containing the compressed air, with the escaping air adding to further tear through ...
[2] [7] [14] Manhole covers shot up into the sky and came crashing down with great destructive force. [14] [15] [16] One manhole cover crashed completely through the ceiling and floor of a third-floor apartment on Second Street, and another narrowly missed a child when it landed in a house at the corner of 9th and Hill streets. [15]
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 ...
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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 ...
A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines. The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps.
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