from The Century Dictionary and Cyclopedia
- n. In rope-drilling, a cylinder, provided with a valve at the bottom, which is lowered into the drill-hole from time to time to remove the pulverized rock, or sludge. Also called sludger.
- n. A powerful water-jet with an annular nozle inclosing a tube which is sunk in loose sand, and operates as an injector to lift the sand with the water which discharges back through the tube.
Sorry, no etymologies found.
Moreover, he was the first person to run his pipes for discharging the sand, not through the shaft, but through the masonry itself; and he invented a very simple and effectual new sand-pump, which was worked by natural forces without machinery.