The message
from The Natural Philosopher contains these words:

If te exgaust were dindensed in te raradiator, it woudl indeed enable a
more efficient engine to be produyced, but teh cat enbsures that the
exhaust temperetures are high enough to make this impossible

Yuletide cheer got the better of your typing finger?

--
Skipweasel
Never knowingly understood. (Ivor Cutler)