Again I can't say anything for certain regarding this particular engine, but I have seen photo's of three cylinder Fowler gun tractors with the third cylinder mounted tandem fashion, presumably on the H.P, cylinder, apparently 'Replacing' the cylinder cover, presumably there would be some steam connection to the 'Transfer port' between HP and LP. It is of course possible that Fowler may have fited a new cylinder when (if?) the third cylinder was removed, Just out of interest, did this engine come out of Hardwickes?
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