oops. i meant "number 474..." and "...off the INSIDE of the tubes in a
> steam engine...." did/do heat exchanger tubes in a steam engine get cruddy?
> or i guess maybe even a stationary boiler.
Nope, not for steam engines. Also it wasn't made to have extensions added to it.
i went to china in 1986 and they were still using steam engines there. it
> was marvelous to ride through the terraced hills of china on a fire
> breathing dragon. i WISH i had the presence of mind to have begged or
> bribed a ride in the engine!!! one night i stayed in a hotel near a train
> yard and it was wonderful to hear a steam engine starting up with a heavy
> load ("CHUFF CHUFF CHUFF") then the drive wheels breaking loose
> ("chuffchuffchuffchuffchuff") and the engineer cutting the power and
> starting up again ("CHUFF CHUFF CHUFF") was wonderful. like time travel.
Sounds like fun.
Rob