MODERN STEAM PRACTICE . 542 Harne acts the crown of the fire box more beneficially . In on … g coal , owing to atmospherical changes . | In some railways a long u - elliptical fire box has been s - adopted ( Fig . 392 ) , having a | fire - brick bridge at the back ° similar to the Cornish boiler , 4 through which air is admitted ■ 5 by a number of apertures . s There are also hanging water…
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