. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . at the platesmay be used for joints. Spike holes may be punched for varyingwidths of rail base where the slotting will permit such punchingwithout the holes interfering with each other and when the plateis of such design that the additional holes will not impair thestrength of the plate. Tie-plates are variously made of steel, wrought iron and malle-able iron. Tie-plates are peculiarly subject to rust, especially §28
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . at the platesmay be used for joints. Spike holes may be punched for varyingwidths of rail base where the slotting will permit such punchingwithout the holes interfering with each other and when the plateis of such design that the additional holes will not impair thestrength of the plate. Tie-plates are variously made of steel, wrought iron and malle-able iron. Tie-plates are peculiarly subject to rust, especially §287. RAIL FASTENINGS. 323 as an effect of brine drippings from refrigerator cars. Thecomparative immunity from rust of malleable iron explains itsuse for this purpose. The specifications for steel and wroughtiron are similar to other physical tests for such a metal whentoughness rather than high ultimate strength is desired. Themalleable iron tie-plates have lugs cast on them for testing pur-poses. When this lug is broken off, it must not break easily, ascast iron, but must show toughness. The fracture must show anarrow band of white metal on the surface, the center portion. WolLaupter
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
