Path: utzoo!attcan!uunet!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: clive@ixi-limited.co.uk (Clive Feather)
Newsgroups: comp.dcom.telecom
Subject: Re: Manhole Covers
Message-ID: <9493@accuvax.nwu.edu>
Date: 6 Jul 90 06:13:21 GMT
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X-Telecom-Digest: Volume 10, Issue 469, Message 7 of 15


People have been talking about constant width curves (such as a triangle with
curved sides, each centred on the opposite vertex). The UK 20p and 50p coins
are seven-sided constant width curves in shape. The constant width property
means that the coin will still roll !


Clive D.W. Feather              | IXI Limited        
clive@x.co.uk [x, not ixi]      | 62-74 Burleigh St. 
 ...!uunet!ixi!clive            | Cambridge   CB1 1OJ
Phone: +44 223 462 131          | United Kingdom