A catechism on the combustion of coal and the prevention of smoke; a practical treatise . ~*>v> *, li ^ iijp ^bT Fig. 60. inner and outer parts of the boiler, and only two connec-tions of any kind between the ends, the functions of whichare to support the inner shell; there is nothing whateverto resist expansion and contraction, and thus hurtfully actupon the material. The corrugations doubtless contributeto freedom of movement, but even if they do not the 282 COMBUSTION OF COAL. plates of the outer shell have the usual opportunity tobuckle. The crown sheet, being the upper half of a cyl
A catechism on the combustion of coal and the prevention of smoke; a practical treatise . ~*>v> *, li ^ iijp ^bT Fig. 60. inner and outer parts of the boiler, and only two connec-tions of any kind between the ends, the functions of whichare to support the inner shell; there is nothing whateverto resist expansion and contraction, and thus hurtfully actupon the material. The corrugations doubtless contributeto freedom of movement, but even if they do not the 282 COMBUSTION OF COAL. plates of the outer shell have the usual opportunity tobuckle. The crown sheet, being the upper half of a cylinder,easily parts with scale which may form upon it, and inthis respect is in direct contrast with the common, flat. Fig. 6i. horizontal crown sheets covered with bolts and crown bars,which are a sufficient means of anchoring all scale whichforms upon the sheet, and equally efficient means of pre-venting inspection and cleaning. The crown sheet of thisboiler is accessible from end to end; an inspector cancrawl all over it, examine every portion, and remove anyscale or dirt which may have lodged upon it. The cir- STRONG S LOCOMOTIVE FIRE BOX. 283 dilation of water is entirely unimpeded; the water un-der the fire box is free to rise without any obstructionwhatever. The inner shell has no joint which is in contact withthe fire, except that connecting the back tube plate andcombustion chamber, which does not differ from commonpractice. The life of this boiler, as shown by actual ex-perience, is three to four times that of the ordinary stayed
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectcoal, bookyear1900
