Steam boiler explosions, in theory and in pactice; . * Locomotive, Feb., 1880. ioS STEAM BOILER Fig. 20.—Defective 21.—Rivet driven in slightlyover-set holes, point eccentric and notsymmetrical, too flat to properly securethe edge of the plate. FlG. 22:—Rivet driven in badly over-set holes, very FlG 2I* weak. See Figs. 23, 24 and 25, which were sheared at the time of the explosion. The dark shading on lower end Fig. 22 indicates an old crack. Figs. 23, 24, 25.—Samples selected from a numbertaken from a sheared seam, which was believed to be

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectsteambo, bookyear1887