William Donzelli wrote:
  A 1900-era relay computer would be big, expensive,
suck juice like
 crazy, and be stupidly slow, but I bet it would work. I can envision
 setting up batch jobs, running them, then seeing how many cycles were
 used, so between jobs workers could do preventative maintenance on the
 relays if some number of cycles was reached. 
That is true with even modern machines.
Ta-Da ... Zuse 3
http://ed-thelen.org/Munich/MunichTripReport.html#Zuse3
  --
 Will
 .