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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.
Cistern in the Mission District, San Francisco, California. The Auxiliary Water Supply System (AWSS, though often referred to on manhole covers and hydrants as HPFS for High Pressure Fire System) is a high pressure water supply network built for the city of San Francisco in response to the failure of the existing emergency water system during the 1906 earthquake.
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 ...
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 ...
He hid under a manhole cover in the exercise enclosure, emerged after nightfall, took a train to Gottmadingen, and reached Switzerland in three days. Dutch Lieutenant Francis Steinmetz also escaped August 15, 1941, with Larive; Dutch Major C. Giebel escaped September 20, 1941, using the same method as Larive and Steinmetz.
They empty a can of petrol into the cellar, ignite it then leave the house. Equipped with overalls, masks, oxygen tanks and two-way radios, Brady and Palmer and go down into the sewer via a manhole cover outside the house. Brady and Palmer test their radios, then begin searching the central chambers of the sewers for the slugs' nest.
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 ...
The title story can be read as a response to stories featuring the many-worlds interpretation as a key plot point, by taking the social implications of infinite realities to a depressing conclusion.