What name is given to the brittle kind of iron used for making engine blocks and manhole covers?
Manhole cover Manhole 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 maintenance and other work on an underground utility vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material. Manhole covers date back at least to the era of ancient Rome, which had sewer grates made from stone. Manhole covers are often made out of cast iron, concrete or a combination of the
Manhole cover theft In Newham, East London, nearly 200 grates and covers were stolen in 2004. A manhole cover designed by artist Antony Gormley was stolen in 2013, ten years after its installation. In March and April 2012, Ajax, Ontario and Niagara Falls, Ontario had dozens of manhole covers stolen. Manhole cover theft Manhole cover theft is the phenomenon of manhole covers being stolen, usually for resale as scrap. Long considered to be a childish prank or simple vandalism, this type of theft is often expensive to municipalities, and dangerous to their residents. In recent years, the theft of manhole covers for financial