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Steam jacketing was used to reduce condensation losses. You control the temperature by throttling the steam in the jacket.Remember, this is a compound, and an early one at that. Steam pressures were probably not really high enough to really take advantage of it.Dave
Having seen the quality of Willie's work, I'd think that if anyone spots the hole spacing, they'll assume that it's meant to be like that.Thanks for the comments about my engine: I've got to dash but I'll see ifIi can start a fresh thread about it, with a bit of background blurb.Kindest regards to all of you,Mitch