Why a Manhole is Round

Manholes are round ….

20140801-170801-61681213.jpg They are Always round.

20140801-170845-61725663.jpg Because …. Well think about it. What would happen if they were Square?

20140801-171002-61802286.jpg
….. Or Rectangle?

20140801-171118-61878927.jpg When you opened a heavy manhole cover , and they are Really heavy…. A square or rectangle or triangle for that matter, could fall in, down the whole!!! There is always a short end that could allow it to slip through the square or rectangular opening. You could left up the top, rotate it then Ooooops …. drop it down the hole.

20140801-171437-62077268.jpg A circle has the same diameter all the way around so if it can rest on an opening that is slightly smaller than the circumference of the circular lid ….
TaDa! It cannot slip into the hole.

20140801-172001-62401501.jpg

20140801-172002-62402549.jpg

Comments

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s