Freaky Facts #1 Manhole

in #fact • 6 years ago

Manhole covers are always round because they rest on a lip that is smaller than the cover. thses means the cover cannot fit through the opening on any angle. a square or rectangle cover could fall through.

hinklr Freaky facts
image: https://www.artsfon.com/pic/201511/2560x1600/artsfon.com-77181.jpg

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6 years ago in #fact by
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     6 years ago 

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       5 years ago 

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