sirable , they can be strongly stayed with conical tubes , having the water inside of the tubes , which are most efficient stays , and give extra heating surface , and no boiler having large or flat flues should be without such a means of Support . The tube - Fig . 45 . — Conical Water Tube - stays… … Fig . 46 . — Flat Fire - box . boiler explosions ; but on no account should a boiler so fitted be tampered with . For staying the end - plates of round boilers T - irons are sometimes introduced , having long rods of round iron passing from end to end of the boiler , and jointed with pins and
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