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:
“I wouldn’t pray just for a old man that’s dead because he’s all right. If I was to pray, I’d pray for the folks that’s alive and don’t know which way to turn. Grampa here, he ain’t got no more trouble like that. He’s got his job all cut out for him. So cover him up and let him get to it.”
—Nunnally Johnson (1897–1977)