out passing one abovethe other. In other boilers, however, the flues, after passingbackwards and forwards near the bottom of the boiler, turn 133 STEAM NAVIGATION. upwards and pass backwards and forwards through a level of thewater nearer its surface, finally terminating in the chimney. Moreheating… … and at the upper parts of the flue, and the least efficient thosewhich are horizontal and at the lowest part, the efficiency of thevertical sides being intermediate. Since the flues are liable occasionally to become choked withsoot and ashes, it is necessary that their magnitude shall besufficient…
Steam-engines · Steam-navigation · Locomotives
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