Beach Day by Rodger Bliss
September 2022
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Manhole Cover

Why are all manhole covers round and not square?

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3 guesses to Manhole Cover


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  • So they fit over the whole, and cover it if they were square they would lay on top.

  • det

    The square cover can fall into the hole, with round cover it’s impossible, and I guess easier to produce round cover. (in my contry we have round (majority) and square manhole covers as well)

  • Yes Det, you nailed it.

    A round cover could never fall into the hole by mistake, whereas a square cover could be turned at the proper angle and be inserted into the hole by hooligans.

    Det, you’re today’s winner!