. The railroad and engineering journal . e of thewalls, and that at high-pressure, for the removal of spoiland water, by a fifth near the bottom. Two i6i-in. pipeswere passed through the upper arches, and two of 13J the bottom of the wall, both series being providedwith slop-valves at the ends. The larger pipes inclinedoutward, and were turned up to a vertical position withinthe chamber. When required for use the inside valve wasopened, the tube filled with spoil and closed again. At agiven signal the outer valve was opened, at the same timeas that connecting the tube with the high-
. The railroad and engineering journal . e of thewalls, and that at high-pressure, for the removal of spoiland water, by a fifth near the bottom. Two i6i-in. pipeswere passed through the upper arches, and two of 13J the bottom of the wall, both series being providedwith slop-valves at the ends. The larger pipes inclinedoutward, and were turned up to a vertical position withinthe chamber. When required for use the inside valve wasopened, the tube filled with spoil and closed again. At agiven signal the outer valve was opened, at the same timeas that connecting the tube with the high-pressure maincontaining air of at least four atmospheres pressure, whichcleared out the contents in a few seconds. The outervalve was then closed and the filling repeated as the same way the water accumulating in the bottom ofthe chamber was driven out by connecting the lower tubeswith the high-pressure air service. The working chamberwas lighted by Edison glow lamps and a Gramme dynamo Vol. LXV, No. i] ENGINEERING JOURNAL. 11.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
