dip workings वाक्य

उदाहरण वाक्य

1. By 1890, with output averaging 1000 tons per day, the underground haulage of coal from the North dip workings by ponies had become unsustainable and a 60HP electrically driven underground rope-haulage system-the first of its kind in the world-was installed near the downcast pit bottom to haul coal up the 1 in 12 roadway from the North workings.