Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 28
. For this reason cylindrical boilers, whichwere very much stronger, took the place of therectangular boilers. The greatest improvement in boiler makingcame, however, when some genius put a centralHue in it and fixed the open ends to the boilerheads, or sheets, as they are called, so that thereis a… … Fig. 7. The Fire-Tube Boiler number of fire tubes, as these flues are called,were then used for they gave a larger heatingsurface and, hence, a higher pressure could be 14 The Boys Book of Engine-Building kept up. The tubular boiler, as this type isknown, see Fig. 8, is largely used for…
Steam-engines
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