. The elements of railroad engineering . .05 11 12 13 14 15 10 17 18 19 20 21 (i 22 23 24 like a bolt head, and an ordinary wrench may beused in fastening the screw in place. A hole of thefull size of the shank of the screw is bored throughthe first timber and a much smaller one is bored forthe balance of the distance th
. The elements of railroad engineering . .05 11 12 13 14 15 10 17 18 19 20 21 (i 22 23 24 like a bolt head, and an ordinary wrench may beused in fastening the screw in place. A hole of thefull size of the shank of the screw is bored throughthe first timber and a much smaller one is bored forthe balance of the distance through which the threadis to pass. A wrought or /////r/zri/washer cut fromsheet iron should be i)laced under the head ofeach lag-screw. The ordinary form of lag-screw isin Fig. 615. Fig. shown RAILROAD STRUCTURES. 1205 1774. Washers.—Cast washers are largely used intrestle building. One should be placed under the head andnut of every bolt used in the structure. The more commonforms of cast washers are shown in Fig. 610, and their. dimensions are given in Table 50. The solid washers areplaced under the head and the slotted washers, or those TABLE 50. DETAILS OF CAST-IRON TVASHERS. Dimensions in Inches. Kind, Fig. 616. Diameter Diameter Diameter Thickness. of Back. of Face. of Hole. A 2f If 1 1 3 B 3 2i 1 1 2 c 3 If 1 f D 3 2 1 1 E 3 n i f F 3 2 f f G 3i 2i 1 f * H 3^ 2i ^1 6 f K 4 2 1 f L 4f 3f 1 18 having a second hole, under the nut. The purpose of theslot, or second hole, is to provide for locking the nut. After ] 206 RAILROAD STRUCTURES. the nut is well tightened, a nail is driven in the slot or holewith the head projecting far enough above the face of thewasher to permit of its being drawn with a claw effectually locks the nut. Wrought washers may beeffectually locked by nicking the thread with a center punchafter the nut has been screwed home. Wrought washers, sometimes called punched, are alsoused to a considerable extent in this class of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
