. Official proceedings . rrosion and incrustation in sections of the country whereMaters are impure not only have a deteriorating effect on thelife of the stay, but in greater proportions affects the fire sheetsand congests the water space, as is shown in the illustration inFig. 4a. A deposit of scale on the fire sheet on the water sideinterferes greatly with transmission of heat to the water andits resistance as a non-conductor is proportional to its thick-ness. Much has been written regarding the effect of scale onthe fire-box surface and stays of locomotive boilers, and surelya remedy which
. Official proceedings . rrosion and incrustation in sections of the country whereMaters are impure not only have a deteriorating effect on thelife of the stay, but in greater proportions affects the fire sheetsand congests the water space, as is shown in the illustration inFig. 4a. A deposit of scale on the fire sheet on the water sideinterferes greatly with transmission of heat to the water andits resistance as a non-conductor is proportional to its thick-ness. Much has been written regarding the effect of scale onthe fire-box surface and stays of locomotive boilers, and surelya remedy which would eliminate this condition without inter-fering with the natural process of generating steam, overcomingthe introduction of chemical constituents into the boiler, whichare liable to cause chemical reaction, which is detrimental to thestrength of sheets through corrosion, would be regarded mostvaluable and vital to the economic service of both locomotiveboiler and fire-box. J94 Proceedings Railway Club of iriCRUSTATIOM-BURAITSHEETS BR9KEM B9LT5- Fig. 4a In the use of the rigid water space stay—the ordinary stay-bolt—quality of material plays a most vital part in the life ofthe staybolt. In determining the value of an iron for staybolt use inlocomotive practice it is most essential that such materialshould be of that nature to withstand constant shock and vibra-tion, high pressure and side strains, and of a character to main-tain its general quality throughout service, to the highest limitof efficiency and safety. The specifications of requirements ordinarily used, andbased on the rulings of the tensile machine, call for the follow-ing claims : A MINIMUM of 48,000 pounds per square inch, tensilestrength. A MINIMUM of 25% elongation on eight-inch sections. That such shall be a double-refined iron, free from blisters Locomotive Water Space Stays. 195 and seams, rolled true to gauge, and taking a sharp to be wholly fibrous. Samples to stand ben
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