. Railway maintenance engineering, with notes on construction . Fig. 54.—Railroad Tie Car. (Power & Mining Mach. Co.) examination of these figures that each group possesses quitedistinctive features, although in some cases groups two andthree take nearly similar treatment. In the process of seasoning, the timbers group themselvesmuch more rapidly than by absorption. Under average condi-tions the following time should be allowed for seasoning: Group 1 10 to 14 months Groups 2 and 3 4 to 6 months Group 4 4 to 5 months TIES 95 4Z00 3600 3000 c2400o o 1800o IZOO600 ^^ --=^ / ^ > 4lr25^ »> &g
. Railway maintenance engineering, with notes on construction . Fig. 54.—Railroad Tie Car. (Power & Mining Mach. Co.) examination of these figures that each group possesses quitedistinctive features, although in some cases groups two andthree take nearly similar treatment. In the process of seasoning, the timbers group themselvesmuch more rapidly than by absorption. Under average condi-tions the following time should be allowed for seasoning: Group 1 10 to 14 months Groups 2 and 3 4 to 6 months Group 4 4 to 5 months TIES 95 4Z00 3600 3000 c2400o o 1800o IZOO600 ^^ --=^ / ^ > 4lr25^ »> >»Group No. I Toledo. 4200 3600 3000 C 2400o ^ 1800O1200 6000. > ^ - / /^ / / / f I 715 Time ,979,BeechTie5, ffxBxS Net Gals, per ♦ »Group 1135 Time. Fig. ,953,A5h,Hick& Net Gals, per Tie. Gross » »> >* . Group Toledo. 4200 3600 3000iP C2400o O 1800o1200 600 330 Time. ,9^,, 6x8x8 Net Gals, per Tie. Gross »» » » . Group Toledo. / f / f / / // / 260220 180 a> 140 ^ «n 100 St60 200 Absorption CurvePressure »» Fig. 55.—Absorption of Different Tie Timbers. 96 RAILWAY MAINTENANCE As grouping by seasoning necessitates treating by the samegroups, unless rehandling is resorted to at the plant, it does notseem desirable to use a grouping entirely on this basis, althoughit should be borne in mind in determining the final arrangementof the timbers. 34. Tie Preservation. Zinc Chloride Process.—This process,frequently called ^ Burnettizing, was invented in 1838 by SirWilliam Burnett of the English Navy. The invention consistedin submitting the wood to the action of chloride of zinc. At firstthe impregna
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
