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From: leeper@ahutb.UUCP (m.r.leeper)
Newsgroups: net.puzzle,net.jokes
Subject: Re: Manhole covers (interview question)
Message-ID: <572@ahutb.UUCP>
Date: Wed, 20-Mar-85 22:10:42 EST
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Posted: Wed Mar 20 22:10:42 1985
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REFERENCES:  <462@nbs-amrf.UUCP>, <1282@amdahl.UUCP> <564@ahutb.UUCP>, <7093@watdaisy.UUCP>

 >> Placed inside a square frame, one side of which is the
 >>length of the breadth of the triangle, a Rouloux shaped
 >>drill bit can be made to follow the edges of the square.
 >> 				Mark Leeper
 >
 >Doesn't that produce a "square" with rounded corners?
 >Doesn't the drill bit have to be exactly triangular to
 >produce an exact square?

It didn't, though I cannot reproduce in my mind exactly how it did it
since a Rouloux triangle has a vertex angle of 120 degrees, so it
shouldn't be able to fit into a square corner.  If it had a 90 degree
vertex angle it seems it would work but not with 120.  Oh well!

				Mark Leeper
				...ihnp4!ahutb!leeper