Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!cory.Berkeley.EDU!heppell
From: heppell@cory.Berkeley.EDU (Kevin G. Heppell)
Newsgroups: sci.electronics
Subject: Re: WHat are those holes for?
Message-ID: <4566@pasteur.Berkeley.Edu>
Date: 20 Jul 88 17:26:54 GMT
References: <10790@oberon.USC.EDU> <327@richp1.UUCP> <303@btree.uucp> <1550@tekirl.TEK.COM> <4862@killer.DALLAS.TX.US>
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Reply-To: heppell@cory.Berkeley.EDU.UUCP (Kevin G. Heppell)
Organization: University of California, Berkeley
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In article <4862@killer.DALLAS.TX.US> ltf@killer.DALLAS.TX.US (Lance Franklin) writes:
>                    ...a equilateral triangle for a manhole cover wouldn't
>fall into the hole either.
>-- 
>+------------------+ +------------------------------------------------------+
>| Lance T Franklin | |  Now accepting suggestions for clever, humourous or  |
>|    ltf@killer    | |  incredibly insightful .signature quote.  Send Now!  |
>+------------------+ +------------------------------------------------------+


  I don't know about you, but I _can_ get a triangular cover down the hole.
  Think about it: a line which divides the cover into two right triangles
  is only sqrt(3)/2 as long as a side - just hold one edge vertical and 
  drop the cover along one side of the hole.

  Round covers also have the advantage of minimizing stress concentration
  (i.e. they distribute loads well) when something drives over.

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    Kevin G. Heppell                            784 Santa Barbara Rd.
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