le , the usual plan being a fan driven by a separate engine ; but in some classes of war ships , such as “ Monitors, ” even this fan is necessary , the “ free - board ” in such ships being so low that in rough weather the hatches require battening down , and then Ventilation must be kept up by… … ät th . 6 centre of the vessel Fig . 32 . — Lo w Boilers , asarranged for the Royal Navy . Lon gitudinal and Horizontal Sections . aa , Furnaces . b , Com - to those 3 . t the sides cind bustion Chamber , c , Tubes . d , Smoke - box . e , Uptake . then passing into the combustion chamber , which…
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