6 ms·
> Incidentally, this is the real reason manholes were round. This doesn't pass the sniff test to me. A manhole lid fits loosely in its frame, and is simply cas
by SECProto 7y ago
> Incidentally, this is the real reason manholes were round.
This doesn't pass the sniff test to me. A manhole lid fits loosely in its frame, and is simply cast. The round shape is used ecause that way the lid cannot fall into the hole (frame is a slightly narrower diameter than the lid is in any orientation)
- hombre_fatal 7y agoBut that works with equilateral polygons as well. How would a square lid fall into a smaller square hole?
- patrickyeon 7y agoDiagonally. The length of a side is considerably shorter (1/sqrt(2) times shorter, actually) than the diagonal.
- mattclarkdotnet 7y agoDiagonally, because the hole is 1.4 times wider diagonally than the cover is on each side
- hombre_fatal 7y agoMe dumb. The hole would have to be much smaller.
- deleted 7y ago[deleted]