. The Locomotive . t has been changed to atriple riveted butt construction, the joint, after placing the buttstraps and riveting, would appear as shown in Fig. 5 on page 145 withthe rivet holes of the original lap joint at B and the new holes at C. Ifa defect existed in the plate as shown at A the joint would be veryfaulty. Assuming the original joint as having the rivet holes spaced3j^4 inches and the additional holes spaced 63^ inches, if the platematerial were defective or contained a lap crack as shown, the failureof the joint would require only the shearing of the rivets in longpitch, or
. The Locomotive . t has been changed to atriple riveted butt construction, the joint, after placing the buttstraps and riveting, would appear as shown in Fig. 5 on page 145 withthe rivet holes of the original lap joint at B and the new holes at C. Ifa defect existed in the plate as shown at A the joint would be veryfaulty. Assuming the original joint as having the rivet holes spaced3j^4 inches and the additional holes spaced 63^ inches, if the platematerial were defective or contained a lap crack as shown, the failureof the joint would require only the shearing of the rivets in longpitch, or 63^ inches, and the failure of the defective plate. It might be argued that the exposure of the inside of the lap seam,when the change to a butt seam is made, would reveal the presenceof a lap seam crack. A crack of this nature is, however, often presentin a boiler of this construction after years of service although it maynot be visible to the naked eye. But, even though no crack exists. I92I.] THE LOCOMOTIVE. 145.
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