MODERN STEAM PRACTICE . 12 tubes of the same diameter ; then down at the back , and along the sides and bottom , through suitable flues of brickwork , so that , … 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 furnace fitted ; the…
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