ES . 53 from getting rubbed away by the mere friction of the tools for raking out the ashes . Some boilers are constructed , as it were , back to back , in one large boiler . By this means two ends are saved , but the great weight of the mass deters many from adopting this plan ; but where large… … Fig . 27 . — Double Boilers . Longitudinal Section and Front Elevation . aa , Furnaces . B b , Combustion chambers . cc , Tubes . d d , Smoke - boxes , ee , Uptakes . air getting better circulated in the stoke hole , but , with suitable air funnels from the deck , the aft furnaces of the boiler can…
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