i6 MODERN STEAM PRACTICE . through an opening into the annular flue , and then escape all round into a flue of brickwork ; thus a large heating surface is obtained . As in the pot boiler , there is great … Fig . 13 . — Annular Boiler . A , Shell , b , Fire - species of steam generator is capable box . c , Annular water space . d , Annular flue . e , Flue . F , Fire - door . Ash - pit . of sustaining great pressure , the whole of the steam pipes and the Connections being tested to about 500 lbs . per…
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