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An air pump pumps the condensate out of a condenser into a hotwell. From there it may be pumped into the boiler. The main reason for having a condenser is to provide a vacuum (except at sea, where fresh water for the boiler is more important).
Very nice! Its amazing how much there was under these engines that almost never got seen. Yes you are right, but, most of it is rusty, dusty, very wet and relatively incomprehensibly !! here are some pics of the sister/brother engine at the Ramm brewery that is quite moist !! also next to the hotwell is the foot well and also a mention of the hotwell as in steam boats....