. The Locomotive . explosion is theresult. In order to prevent the accumulation of the strains in the shell at the ends of thestock-hole, a re-enforcing ring should be provided, as shown by the dotted lines inFig. 1. This ring .should be made of wrought-iron or steel, and never of cast-iron,which is too notoriously uncertain a material to be trusted under tension in so importanta place. Two rings of plate, of suitable width, thickness, and quality, one inside of theboiler and the other outside, make a satisfactory form of re-enforcing ring when thewhole is properly riveted together with two or
. The Locomotive . explosion is theresult. In order to prevent the accumulation of the strains in the shell at the ends of thestock-hole, a re-enforcing ring should be provided, as shown by the dotted lines inFig. 1. This ring .should be made of wrought-iron or steel, and never of cast-iron,which is too notoriously uncertain a material to be trusted under tension in so importanta place. Two rings of plate, of suitable width, thickness, and quality, one inside of theboiler and the other outside, make a satisfactory form of re-enforcing ring when thewhole is properly riveted together with two or three rows of rivets. This form of ringis shown in the upper part of Fig. 1. When a ring is put in in this way, and the work-manship is good, it may fairly be assumed that the tensile strain on the ring m n istransferred to the re-enforcing ring, and hence, if the latter is properly proportioned, themain sheet, at the ends of the stock-hole, is protected from the extra strain that wouldotherwise be thrown upon t IG. Ax Exploded IlOtary. 189G.] THE LOCOMOTIVE. 179 Tlie function of the re-enforciug riug being once understood, the method offinding its widtli and thickness easily follows. For since the ring is intended to bearthe strain due to the shell-section m n, it is evident that it should have a sectional areaat least as great as the sectional area cut away from m n in making the is, the combined area of the black sections in Fig. 1 should be at least equal tothe sectional area of a strip of the main shell, of a length e<jual to the length of thestock-hole. We proceed to illustrate this principle by an example, and for this purpose we as-sume the general proportions of the plates and stock-hole to be as follows: Platesare of steel (60,000 lbs. T. S.), and f thick. Stock-hole is 24 wide and 42 these dimensions given it is easy to see that the sectional area cut away from theplate in making the stock-hole is 42 X f = sq. in. We therefore
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
