d , the heated gases , after doing duty in the boiler , sim - Fig . 5 . — Return Tubulär Boiler . Longi tudinal Section . ply going up the chimney . There are several arrangements having all the same object in view , namely , to economize space . By one of them an ordinary round shell has a square… … Fig . 6 . — Self - contained Flue Boiler . Longitudinal and Transverse Sections . A , Shell , b , Fire - box . c C , Flues . d , Stay tubes . e , Steam dome . f , Fire - door . amongst them , makes a very effective arrangement , and in cases where the water , from its impure state , rapidly forms…
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