BOILERS FOR MARINE PURPOSES . 55 the flues being divided with suitable water spaces , and are strength - ened at the top and bottom with conical tube stays , through which the steam rises and the circulation is effected . The water in the boiler is thus freely circulated , with the advantage of… … Fig . 29 . — Overhead Flue Boilers . Longitudinal and Transverse Sections . aa , Furnaces . ß , Combustion chamber . c , Flues . dd , Circulating tubes . e , Uptake . rate body of water , which , under certain circumstances , conduces to rapid evaporation . There are side doors at the bottoms of…
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