. The Locomotive. sed, or buckled. The force of the expansion and contraction is limited only bythe strength of the iron of the plates. It will readily be seen that this constant strain on the joint will very soon loosen therivets and injure the plates. In this case the outer plate gave away by cracking fromthe rivet holes to the outside of the plate as seen in Fig. 1. This became so bad that itwas necessary to cut out a piece of the plate forming the outer lap (from this piece ourcut was photographed) and put on a patch. The inner lap was injured very little. Single riveted joints should alwa
. The Locomotive. sed, or buckled. The force of the expansion and contraction is limited only bythe strength of the iron of the plates. It will readily be seen that this constant strain on the joint will very soon loosen therivets and injure the plates. In this case the outer plate gave away by cracking fromthe rivet holes to the outside of the plate as seen in Fig. 1. This became so bad that itwas necessary to cut out a piece of the plate forming the outer lap (from this piece ourcut was photographed) and put on a patch. The inner lap was injured very little. Single riveted joints should always be used in parts of a boiler which are exposedto the fire; for then, the plates being confined at but one point are free to expand andcontract at will, and no strain is brought upon the joint. It should be said in justice to the boilermaker that in the abov» mentioned case hestrenously objected to double riveting the girth seams, but tlie owner of the boilerwould have them made so, and took the Fig. 2. Figs. 2 and 3 show the result of allowing sediment to collect on the lower tubesheet of an upright tubular boiler. It is a very remarkable case. The head was one-half inch thick, the material, steel. In consequence of an accumu-lation of sediment between four adjacent tubes, the head at this point l>ecame highlyoverheated, almost melted in fact, so that it bagged down over three-eighths of an inch
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
