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Brian, Based on the photographic evidence and the 1842 plan (any chance of a getting scan of the plan to look at?), I'd be happy with this boiler being part of a early heating system of sorts (though I'm not sure how effective it would have been). I've had a look through some of my text books, and the design of this boiler is not consistent with any steam generating design I'm aware of - From early 'haystack' to multi-tube designs. Jason Lucas. On Mon, 2004-02-09 at 23:50, Brian Durham wrote: > Peter - Thanks for this, and hold everything chaps, two developments. > > OA have produced a plan of 1842 that shows a boiler in pretty much the > right location with ?? water pipes going through the wall behind the > boiler into a chamber that appears to be producing heated air > distributed to each prison cell on four floors of the wing. How could > we have overlooked this? Unless things change substantially that's what > the boiler was doing. > > Without seeing the photos, Rob Kinchin Smith suggested it was a `wagon > top boiler', but tells me that the top is not in fact the right shape, > and would have needed a reservoir for steam. As I understand it he is > thinking it has to be a water boiler therefore, and is saying that some > support for the later date would be if the bolts are hexagonal as > opposed to square. > > If you don't hear from me for a week or so, someone feel free to remind > me and I'll update the list. Thanks to all. - Brian <SNIP>