. The elements of railroad engineering . Fig. 571. Fig. 572. When all the posts are battered, the distance between themat the top is fixed. The outside posts have a uniform batter irrespective ofheight, while the inside posts change their batter with eachchange of height (Fig. 572). The caps, if solid, should be of not more than 12-in. by12-in. timber. In a majority of cases 10-in. by 10-in. tim-ber would serve equally well, often insuring better timberand resulting in considerable saving of material. There areseveral different ways of joining the sills, posts, and capstogether, but only three
. The elements of railroad engineering . Fig. 571. Fig. 572. When all the posts are battered, the distance between themat the top is fixed. The outside posts have a uniform batter irrespective ofheight, while the inside posts change their batter with eachchange of height (Fig. 572). The caps, if solid, should be of not more than 12-in. by12-in. timber. In a majority of cases 10-in. by 10-in. tim-ber would serve equally well, often insuring better timberand resulting in considerable saving of material. There areseveral different ways of joining the sills, posts, and capstogether, but only three are in general use, viz., by mortiseand tenon, by drift bolts, and by dowels. A tenon 3 inches thick, 8 inches wide, and 5 inches long isa good size. The mortise should be about ^ inch deeperthan the length of the tenon and well finished, so that thetenon will fit snugly. In boring the hole for the treenail,the same precaution should be taken with framed bents aswith pile bents. All mortises so placed as to hold watershould be provided
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
