A manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
They date back at least to the era of ancient Rome, which had sewer grates made from stone.
Read more about Manhole Cover: Description, Circular Shape, Manhole Covers and Race Cars, Propelled Into Space, Other Uses, Gallery
Famous quotes containing the word cover:
“If I use the media, even with tricks, to publicise a black youth being shot in the back in Teaneck, New Jersey ... then I should be praised for it, and it’s more of a comment on them than me that it would take tricks to make them cover the loss of life.”
—Al, Rev. Sharpton (b. 1954)