. American engineer and railroad journal . r process of makingsteel, and for some time after, until confidence in that materialwas established, fagoted iron was the only material availablefor engine and machine forgings, and notwithstanding its ten-dency to establish seams, and evident laminations, it servedits purpose admirably, and even now, in the presence of mildsteels of the highest excellence, an excellence far beyond thehopes of their several inventors, it continues to hold its all difficult shapes where steel castings are not permissi-ble, and where piecing up after partial mac
. American engineer and railroad journal . r process of makingsteel, and for some time after, until confidence in that materialwas established, fagoted iron was the only material availablefor engine and machine forgings, and notwithstanding its ten-dency to establish seams, and evident laminations, it servedits purpose admirably, and even now, in the presence of mildsteels of the highest excellence, an excellence far beyond thehopes of their several inventors, it continues to hold its all difficult shapes where steel castings are not permissi-ble, and where piecing up after partial machining is neces-sary, and, further, where case-hardening is called for, agood iron is essential, and will hold the field in [its propersphere. Then, for the screw shafts of steamers and piston-rods forsteam-hammers, iron lasts longer than steel, unless the latterare oil-tempered before using. An iron rod in one of ourhammers was in constant use over 13 years, and [is now good,but kept as a duplicate. I never heard of a steel rod half that. TTt^^^T^rrTTT 7 r v \ ^n Submarine Gun tor the^OettroyerT home, until its base is in the position shown by the dottedlines in the figure, at which time the washer p will fit the boresnugly. The powder charge centered in the bore on the legsof its case is then inserted, the electric primer fltteti, and thebreech closed. The shutter O is opened ; then the valve I, admitting com-pressed air in rear of the piston/and forcing it and the pro-jectile forward in the bore, to the position shown in the forward movement is stopped, in this position, by theannular ring on the rear face of the piston taking against theshoulder d. The stop-screw y is then screwed down as a safe-guard to prevent the projectile from being forced in by thewater pressure, should it from any cause exceed that of theair pressure. The viilves n and ^are then closed and the gun fired. Thepressure of the powder gas causes the annular base ring of thepiston to curl back w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
