I think a non-polluting steam engine would be possible - those early
steam locos used on the Metropolitan railway had condenser bells over the
smoke stack which collected most of the steam and coal smoke. One can run
small engines off of those little lighter tablets which burn completely
clean. Then we just need to collect the waste steam.
Possibly for the duration of a run, one might get away with a large
balloon in which to collect the output from the cylinder. The only
problem is that this would then constitute a hot air balloon, so the mouse
might take off.
Come to think of it, have we put a clause in the rules requiring the mouse
to stay in contact with the floor of the maze? Surely the fastest way to
get to the centre would just be to fly up and over in a straight line?
Dr Adrian Johnstone, Senior Lecturer in Computing, Computer Science Dep,
Royal Holloway, University of London, Egham, Surrey, TW20 0EX, England.
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