. The railroad and engineering journal . m. (4,952 ft.) long ; it was a cable road worked by a sta-tionary engine placed at the top of the hill. The machinesfor breaking the stone, working the sand, etc., were placedon a small plateau about half-way down the hill, which canalso be seen in fig. 10. One interesting part of the work was the plan adoptedfor hoisting the material to the top of the piers. Untilthese piers reached a point about 30 m. ( ft.) abovethe ground the stone was taken up by an ordinary derrickand steam-hoist. Above that level the hoisting was donein the interior of the p
. The railroad and engineering journal . m. (4,952 ft.) long ; it was a cable road worked by a sta-tionary engine placed at the top of the hill. The machinesfor breaking the stone, working the sand, etc., were placedon a small plateau about half-way down the hill, which canalso be seen in fig. 10. One interesting part of the work was the plan adoptedfor hoisting the material to the top of the piers. Untilthese piers reached a point about 30 m. ( ft.) abovethe ground the stone was taken up by an ordinary derrickand steam-hoist. Above that level the hoisting was donein the interior of the pier—the large piers being made hol-. low, as noted hereafter—by a cage somewhat similar tothose used in mine shafts for hoisting material ; the hoist-ing rope passing below over the drum of a hoisting engineand above over pulleys supported on a frame. The guidesfor the cage consist of U-shaped irons, one placed on either Vol. LXIV, No. 3.] ENGINEERING JOURNAL. 107 side, and held in place by bolts embedded in the 13 and 13 show the hoisting cage used, fig. 12being a front elevation and fig. 1$ a side view. The smallwagons containing stone or mortar were run upon thiscage at the bottom through an archway left in the side ofthe pier,and at the top they were rolled from the cage and
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
