. Electric railway journal . he plate, which has an enormous keyhole in it and isheld by a special carrier rod, is slipped over the rod anddown till the narrow part of the keyhole locks againstthe head. All of these patent anchors have certain advantagesover the deadman, and all have their faults, some morethan others. Their one absolutely necessary require-ment for successful installation is a soil reasonably freefrom large stones. An occasional bone can be dodgedby shifting the location, but where such shifts are fre-quent it pays to set deadmen. The large trench neces-sary gives opportunity
. Electric railway journal . he plate, which has an enormous keyhole in it and isheld by a special carrier rod, is slipped over the rod anddown till the narrow part of the keyhole locks againstthe head. All of these patent anchors have certain advantagesover the deadman, and all have their faults, some morethan others. Their one absolutely necessary require-ment for successful installation is a soil reasonably freefrom large stones. An occasional bone can be dodgedby shifting the location, but where such shifts are fre-quent it pays to set deadmen. The large trench neces-sary gives opportunity to deal with any kind of rocksthat may be encountered nearer the surface than theproper position for the log. If small, such rocks canbe removed; if they are of sufficient size, however, theobvious procedure would be to use them as anchors byinstalling rock bolts. If the rock is tough, a suitable rock bolt would be apair of wedge-shaped side pieces with bolt holes at thetop, which are dropped into a tapered hole in the line. PIG. 2—S HORT-LEADGUYS ON HEAVY WORKN. Y., N. H. & H. NEARNEW HAVEN, guy plates and guyhooks at pole of the pull of the guy and are held againstthe walls of the hole by a key fitting be-tween them. This in turn is preventedfrom working out by a bolt through thetops of the wedges, to which bolt the guy isattached. The extra work of making thebottom of the hole larger than the top ismore than offset by the fact that its depthis but 6 in. as against 15 in. for the othertype. Although a standard articlethe wedgebolt is comparatively little used even inrock which, having the necessary strengthto withstand its splitting tendency, is, byreason of that same fact, particularlycostly to drill for the commoner type. Thecommon type of rock bolt is a rod 1 in. indiameter, with an eye in one end. Al-though sometimes made with roughenedsides, or with the lower end split to takea wedge which rests against the bottomof the hole and jams the parts of thesha
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