Manhole covers

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Manhole covers

ldthemagicman

British Standard 497 still refers to them as "Manhole Covers"

They were given that name because a man went down into the "Manhole", or "Inspection Chamber", or "intercepting Chamber", or "Silt Pit", to perform any necessary procedure.

A "Lamphole Cover" was a cover for a much smaller chamber, big enough to allow an oil-lamp to be lowered on a rope into the sewer, to confirm visually, (from upsteam and downstream), that the sewer was not blocked.

Or you could perform a smoke test with a smoke bomb; or use drain rods with a badger, and ... ...

A-a-a-h! Happy, happy days.

No, I was not an Engineer --- I was a Quantity Surveyor, but I was a bit of an expert on Drainage --- a sort of "Connais-Sewer", (as the French say).

Les

22 Feb 2012

colibrita

Connais sewer! Groan!

Les, as always the workings of your brain have me in awe. A beautiful mind indeed.

The answer to the teaser is very simple in fact. Turn a square manhole (or personhole!) round and diagonally it could fall in the hole. This can �t happen if it �s round.

If anyone is remotely curious as how on earth i got onto the subject of manhole covers it all started with a piece I was looking at yesterday on the absurdest interview questions of 2011. Things like:
How would you get an elephant into a refrigerator? orHow many people are using Facebook in San Francisco at 2:30pm on a Friday?
http://www.glassdoor.com/blog/top-25-oddball-interview-questions-2011/

Enjoy!

22 Feb 2012

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