On Thu, 14 Feb 2008, Gavin Melville wrote:
  Not completely on topic, but my boss wishes to build a
computer using
 modern knowledge, but only materials, IO etc that existed as at 1st Jan
 1900.    The basic premise is that had a need existed, and they knew how
 to make one, could have it been done.
 That initially seemed hard, and certainly isn't easy, in that I'm the
 one doing the "building" :-)  however we have fairly quickly identified
 that magnetic logic is the only likely candidate. 
I'd be thinking fluidic logic, but I'm strange.
--
roger ivie
rivie at 
ridgenet.net