the steam is superheated , it should be mixed with the steam in the boiler ; little advantage exists , however , in this arrangement , for it appears a very doubtful proceeding to heat up the steam , and then rob it of a portion of the heat by mixing it again with steam from the boiler . The main… … be classed just as are steam - boilers . The Fig . 40 . — Cylindrical Superheater . plain cylindrical form has an outer shell , containing a single large tube , the inner tube being stayed with rings of angle - iron ; where double round boilers are used , firing fore and aft , the part fitting on…
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