. Official proceedings . rthe required margin of safety. The diameter of the stays varyfrom J to 1 when new, and are pitched equally over the en-tire surface of the fire sheet, generally from 3! to 4 from cen-ter to center of staybolt, each bolt exposed to a strain equal tothe square of the pitch multiplied by the working pressure inpounds per square inch. * The safe stress allowed on the cross section of a water spacestay by the United States rule is 6,000 pounds per square inch,irrespective of the difference in stress between the short andlong stays. The tensile stress in a water space stay
. Official proceedings . rthe required margin of safety. The diameter of the stays varyfrom J to 1 when new, and are pitched equally over the en-tire surface of the fire sheet, generally from 3! to 4 from cen-ter to center of staybolt, each bolt exposed to a strain equal tothe square of the pitch multiplied by the working pressure inpounds per square inch. * The safe stress allowed on the cross section of a water spacestay by the United States rule is 6,000 pounds per square inch,irrespective of the difference in stress between the short andlong stays. The tensile stress in a water space stay is the load applieddue to the working pressure on the surface of the plates, andso far is the only factor taken into consideration in connectionwith the ordinary or rigid staybolt, as shown in Fig. 1, yet inaddition to the tensile stress due to pressure on the plateswithin the water and steam space, these stays are subjected tostrains from the unequal expansion of outer and inner sheets. Locomotive Water Space Stays. 193. To overcome staybolt breakages certain modifications ofthe original stay have been made, as shown in Figs. 3 and 4,that of simply turning off the threads in the center of the boltexposed in the water space, followed by a greater reduction ofdiameter, as shown in Fig. 4, for the purpose of giving flexi-bility to the bolt to more readily withstand the reversal straindue to expansion. While it has been found that the reduction of the diameterin the water space has not been of any material benefit to tilelife of the staybolt, it has the preference over the full threadedbolt to the extent that deposits, carbonates and sulphates oflime and magnesia, which precipitate from the waters used, donot adhere so closely and do not impair the quality andstrength of the iron to such a marked extent as when threaded. Corrosion and incrustation in sections of the country whereMaters are impure not only have a deteriorating effect on thelife of the stay, but in greater proportio
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