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From: ph@wudma.UUCP
Newsgroups: net.puzzle
Subject: Re: Manhole covers (interview question)
Message-ID: <224@wudma.UUCP>
Date: Wed, 20-Mar-85 23:55:40 EST
Article-I.D.: wudma.224
Posted: Wed Mar 20 23:55:40 1985
Date-Received: Fri, 22-Mar-85 01:26:32 EST
Organization: Washington U. in St. Louis, CS Dept. DMA Project
Lines: 21

> > 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?
>    Norman Diamond

	Yes, it does, but using an exactly triangular bit doesn't help;
	it only allows the bit to jiggle around more.  Incidentally, any
	of you mechanical types out there care to discourse on the
	problems involved in driving the bit when it doesn't rotate
	around a fixed axis?  I've always wondered about how that was
	done.

						--pH
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