Quote:
Originally Posted by look 171
All are very interesting. I am stumped with this. What did they expect the outcome from that one?
|
Because a round manhole cover cannot fall into the manhole.
a square, or oval manhole cover could and obviously eventually would
An even triangle could work fine, but more manufacturing cost + more hassle since it needs aligning to manhole.. a round manhole cover is always aligned with the round manhole...