Prescence of Mind

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3 Responses

  1. there was one more reason for manholes covers to be round because when they had to transport them, it was very difficult to transport square ones than the round ones because of easy motion..

  2. yredd says:

    there are many reasons for the manholes to be round like
    ->Round tubes are the strongest and most material-efficient shape against the compression of the earth around them, and so it is natural that the cover of a round tube assume a circular shape.
    ->The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.
    ->Round castings are much easier to machine using horizontal boring mills.
    ->Circular covers do not need to be rotated to align them when covering a circular manhole.
    ->Human beings have a roughly circular cross-section.
    ->A round manhole cover can be more easily moved by being rolled.
    ->If an automobile rolls over a dislodged manhole of another shape, the sharp corners could puncture the automobile’s tire, whereas a circle doesn’t have corners.

  3. Graham says:

    and a round one cannot fall through the hole it fits into, where as a square one could fall through diagonally đŸ™‚