Norris asked about the Elswick Hopper split seat tube machine. It was
actually a twin tube variation which achieved a wheelbase of 37½,
and
used twin tubes to accommodate a floating chainwheel to overcome the
chain alignment problems the short wheelbase produced. You can see
photos on my machine at http://www.wooljersey.com/
Peter Brown, Lincolnshire, England
Not too far from where the Avenger Convincable was made.