First one who knows why manhole covers are round gets 10 easy points!?!
Question: First one who knows why manhole covers are round gets 10 easy points!!?
Answers:
so the lid wont fall through Www@Enter-QA@Com
A round manhole cover cannot fall through its circular opening, whereas a square manhole cover may fall in if it were inserted diagonally in the aperture (A Reuleaux triangle or other curve of constant width would also serve this purpose, but round covers are much easier to manufacture!.)
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!.
It's easier to dig a circular hole!.
Tradition
Aesthetics
Supply!. Most manhole covers are made by a few large companies!. If you want a different shape, you will have to pay more to have them custom-made or you will have to make them yourselfWww@Enter-QA@Com
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!.
It's easier to dig a circular hole!.
Tradition
Aesthetics
Supply!. Most manhole covers are made by a few large companies!. If you want a different shape, you will have to pay more to have them custom-made or you will have to make them yourselfWww@Enter-QA@Com
Because of the shape of the hole!. If the hole is round, so is the lid!. If it is rectangular, the lid's gonna be rectangular, too, lol!
I know my answer is late, but this question is worth answering! ;)Www@Enter-QA@Com
I know my answer is late, but this question is worth answering! ;)Www@Enter-QA@Com
Because the lids are so heavy they are round to move them!. You can roll them over to the sideWww@Enter-QA@Com
I hate to break it to you but many are rectangular!.Www@Enter-QA@Com
So they don't rattle when vehicles drive over them!.!.!.!Www@Enter-QA@Com
Less likely to have the dirt cave in around it!.Www@Enter-QA@Com
Cause the hole is round!.Www@Enter-QA@Com
because the manhole is roundWww@Enter-QA@Com
So the lid won't fall into the whole!.Www@Enter-QA@Com
man likes hole!.!. u pervertWww@Enter-QA@Com