. American engineer and railroad journal . n curved surfaces. As will be seen in the illustrations, the only material differ-ence in this device from the usual drill post is in the construc-tion and method of securing the base. The base here consists ofa semi-circular piece of boiler plate y2-in. thick, flanged so as - i AMERICAN ENGINEER AND RAILROAD JOURNAL. to leave a 3-in. right-angle turn and a full half cir-cular base. In the center of this base a J^-in. holeis drilled and lV$ in. from the circumference a se-ries of equally spaced holes are also drilled. Theright-angle flange is provided
. American engineer and railroad journal . n curved surfaces. As will be seen in the illustrations, the only material differ-ence in this device from the usual drill post is in the construc-tion and method of securing the base. The base here consists ofa semi-circular piece of boiler plate y2-in. thick, flanged so as - i AMERICAN ENGINEER AND RAILROAD JOURNAL. to leave a 3-in. right-angle turn and a full half cir-cular base. In the center of this base a J^-in. holeis drilled and lV$ in. from the circumference a se-ries of equally spaced holes are also drilled. Theright-angle flange is provided with yA x 2fg-in. slotslocated 7s in. from each end, and through these slotspass the bolts that are to secure the device to itssupport. The standard is of forged soft steel drawn square10 in. from the end, and in this square portion aslot 54 x by* in- is cut and two holes H in. diameterand 3% in. apart, drilled at right angles to the slot,permit pins to be dropped through the standard andbase, the back pin acting as a pivot. By placing i.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
