mely , that a great portion of the heat passes directly up the chimney without doing duty ; to obviate this defect the flame and heated gases are directed downwards with suitable flues ; this plan must have separate flues of fire - brick , with a chimney , and is not so compact an arrange - ment as… … F B S FirelbS ’ t ? pÖt r D A fubes ' su ' ta Me sludge doors . The dry uptake can be E,Fire - door . F,Smoke - P ipe . easily removed , and the inside of the boiler in - spected through the man - hole , placed exactly over the pot , in the
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