. Bulletin. Forests and forestry -- United States. —.Sills, \°\ [WhiteOak Sc*L£:£- iticu=l Foot. Fig. 7.—Showing construction with two vertical and two standing legs. cinders will usually lodge between the ties on top of the stringers or For this reason it is I rn> between the stringers on top of the cap. a good practice to cover the top of the stringers, from end to H end, with a galvanized-iron sheet bent down over the edges. It will not only protect the stringers against the weather, but it will also largely protect the structure against lire, on account of which a large amount of wooden
. Bulletin. Forests and forestry -- United States. —.Sills, \°\ [WhiteOak Sc*L£:£- iticu=l Foot. Fig. 7.—Showing construction with two vertical and two standing legs. cinders will usually lodge between the ties on top of the stringers or For this reason it is I rn> between the stringers on top of the cap. a good practice to cover the top of the stringers, from end to H end, with a galvanized-iron sheet bent down over the edges. It will not only protect the stringers against the weather, but it will also largely protect the structure against lire, on account of which a large amount of wooden trestlework each year has to be renewed. Another method used with success against tire is planking over the stringers and gravel between the ties, used by Mr. Bouscaren on a long trestle near New Orleans. As regards longitudinal bracings between trestle bents, no general rules would be applicable. It will always depend upon the local con- ditions. Where the trestle is high or on a curve or on uncertain bottom, special provisions of bracings will have to be made. It may not be amiss to say—although not directly connected with the subject under discussion—that no better way of economizing timber in the construction of railroads could be devised than doing away with trestles altogether. 25665—No. 12-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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