Thursday, December 9, 2010

Oxford - manhole covers ...

... a utility plate bearing the name Lucy & Co ...
  
... Lucy's Eagle Ironworks, Oxford ...
 by en.wikipedia.org
... an ironworks owned by Lucy's on the Oxford Canal in Jericho,
Oxford. The ironworks was on Walton Well Road at the northern
end of Walton Street and backed onto St Sepulchre's Cemetery.
The site was demolished in 2007 and has been redeveloped,
mainly with apartments ...
  
 ... Thames Water ...
  
 ... Thames Water Warrior ...
  
 ... Thames water valve cover with yellow stripes ...
  
... bear manhole cover made by Broads of London ...
  
Why is a manhole cover round? A Microsoft interview question.
source: Brian Groth's Life at Microsoft
So, why is a manhole cover round? Heck if I know, but 
here are some good answers that I've heard over the years:
  
   1. Because the hole is round (duh!) ...
   2. Because animals dig round holes,
       so it feels natural to humans too ...
   3. Because a circle offsets the straight
       lines of a city ...
   4. Because it is easier to roll the cover
       some distance than carry it ...
   5. Because it won't fall into the hole - but,
       the same is true for an equilateral triangle ...
   6. Because it is easier to pour hot metal into
       a circular mold than one with sharp corners ...
   
a Manhole cover ...
 by en.wikipedia.org
... is a removable plate forming the lid over the opening
of a manhole, to prevent anyone from falling in
and to keep unauthorized persons out ...

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