. The railroad and engineering journal . in thickness is built up of a number of thinner plates asbefore. Alter this plate is forged, and before cooling, it isplaced in an iron mold about 28 in. in depth, and uponits face is run a layer of very mild steel—Bessemer or. Siemens-Martin—about 13 in. in denh. When cool theplate is taken from the mold, reheated, and then rolled orhammered until the thickness is reduced to about 18 forms the back of the compound plate. After being replaced in the mold a layer of hard steel, about S in. inthickness, is run upon the originally exposed face of t
. The railroad and engineering journal . in thickness is built up of a number of thinner plates asbefore. Alter this plate is forged, and before cooling, it isplaced in an iron mold about 28 in. in depth, and uponits face is run a layer of very mild steel—Bessemer or. Siemens-Martin—about 13 in. in denh. When cool theplate is taken from the mold, reheated, and then rolled orhammered until the thickness is reduced to about 18 forms the back of the compound plate. After being replaced in the mold a layer of hard steel, about S in. inthickness, is run upon the originally exposed face of thewrought-iron plate, giving a thickness of about 26 in. Itis then removed from the mold and after being reheatedis reduced by rolling or hammering to the required thick-ness of 20 in. The hard steel lace of these plates containsfrom to per cent of carbon. Sir John Brown &~ Companys Plate {Ellis patent).In manufacturing this plate, shown in tig. 3, a soft, wrought-iron backing is prepared in much the same way as in theordinary Wilson process. A hard, steel-finished plate isalso prepared. The steel plate is laid over the foundation-plate, their surfaces being kept about two inches apart bywedges and small sleel studs. The whole is then heated in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
