If they were made of wood they would rot and have to be replaced frequently. The metals used are also inexpensive.
Neenah, Wisconsin
yes
Manhole covers are used for many things. Manhole covers are used to cover up holes in the ground where sewage can be found in order to protect people.
If they were rectangular they could fall down the manhole.
Get a crow bar and you can easily lift it out. Then you can do whatever you want in the manhole. Also manhole covers scrap at a junk yard for about 10 bucks.
"Manhole covers" are simply spelled "manhole covers". The reason most of them are perfectly round is that a round cover cannot slip down into a hole that is even just slightly smaller than the cover (as can oblongs or squares).
steel
Round manhole covers are generally used over square manholes because they cannot fall through the manhole openings. There is a chance that if square manhole covers are used they can be turned at an angle and fall through the manhole opening. Round manhole covers can be moved more easily as well.
Paco Corporation manufactures steel, aluminum, and stainless steel manhole covers. There are a number of manufactures that make fiberglass manhole covers. 9945 S Industrial Dr. Bridgeview, IL 60455 Tel: 708-430-2424 Fax: 708-430-0056 http://www.pacograting.com
Manhole covers are easier to handle and align when they are round because a circular shape cannot fall into the hole it covers, reducing the risk of accidents. Round covers are also easier to roll into place and do not need to be rotated to fit properly. This makes them more practical and efficient for workers who need to access the manhole.
The round manhole cannot fall into the hole no matter which way you turn it.
They are called man holes, or manhole covers.